C for Swimmers

C For Swimmers
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If u don't know how to swim, learn it now. Otherwise participate in the competition.

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Topic : C Fundamentals
Data Types, Constants & Variables (First 5 queries, Ref: PROGRAMMING WITH C - Schaum's Outline Series)
Playing with scanf function
Operators & Expressions

*************************************************************************************************
* NOTE : All the programs are tested under Turbo C/C++ compilers. *
* It is assumed that, *
* *=> Programs run under DOS environment, *
* *=> The underlying machine is an x86 system, *
* *=> Necessary header files are included. *
* *=> Program is compiled using Turbo C/C++ compiler. *
* The program output may depend on the information based on this assumptions. *
* (For example sizeof(int) = 2 bytes may be assumed). *
*************************************************************************************************


[Q001]. Determine which of the following are VALID identifiers. If invalid, state the reason.
(a) sample1 (b) 5sample (c) data_7 (d) return (e) #fine
(f) variable (g) 91-080-100 (h) name & age (i) _val (j) name_and_age
Ans. (a) VALID
(b) Invalid, since an identifier must begin with a letter or an underscore
(c) VALID
(d) Invalid, since return is a reserved word
(e) Invalid, since an identifier must begin with a letter or an underscore
(f) VALID
(g) Invalid, since an identifier must begin with a letter or an underscore
(h) Invalid, since blank spaces are not allowed
(i) VALID
(j) VALID
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[Q002]. Determine which of the following are VALID character constants. If invalid, state the reason.
(a) 'y' (b) '\r' (c) 'Y' (d) '@' (e) '/r'
(f) 'word' (g) '\0' (h) '\?' (i) '\065' (j) '\'' (k) ' '
Ans. (a) VALID
(b) VALID
(c) VALID
(d) VALID
(e) Invalid, since escape sequences must be written with a backward slash (i.e. \)
(f) Invalid, since a character constant cannot consist of multiple characters
(g) VALID (null-character escape sequence)
(h) VALID
(i) VALID (Octal escape sequence)
(j) VALID
(k) VALID
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[Q003]. Determine which of the following are VALID string constants. If invalid, state the reason.
(a) 'Hi Friends' (b) "abc,def,ghi" (c) "Qualification
(d) "4325.76e-8" (e) "Don\'t sleep" (f) "He said, "You\'re great"
(g) "" (h) " " (i) "Rs.100/-"
Ans. (a) Invalid, since a string constant must be enclosed in double quotation marks
(b) VALID
(c) Invalid, since trailing quotation mark is missing
(d) VALID
(e) VALID (single-quote escape sequence)
(f) Invalid, since the quotation marks and (optionally) apostrophe within the string
cannot be expressed without the escape sequences.
(g) VALID
(h) VALID
(i) VALID
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[Q004]. Determine which of the following numerical values are valid constants. If a constant is
valid, specify whether it is integer or real. Also, specify the base for each valid integer constant.
(a) 10,500 (b) 080 (c) 0.007 (d) 5.6e7 (e) 5.6e-7
(f) 0.2e-0.3 (g) 0.2e 0.3 (h) 0xaf9s82 (i) 0XABCDEFL (j) 0369CF
(k) 87654321l (l) 87654321
Ans. (a) Invalid, since illegal character(,)
(b) VALID
(c) VALID
(d) VALID
(e) VALID
(f) VALID
(g) Invalid, since illegal character(blank space)
(h) Invalid, since illegal character(s)
(i) VALID
(j) Invalid, since illegal characters (9, C, F), if intended as an octal constant.
(k) VALID
(l) VALID
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[Q005]. Determine which of the following floating-point constants are VALID for the quantity (5 * 100000).
(a) 500000 (b) 0.5e6 (c) 5E5 (d) 5e5 (e) 5e+5
(f) 500E3 (g) .5E6 (h) 50e4 (i) 50.E+4 (j) 5.0E+5
(k) All of the above (l) None of these
Ans. (k)
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[Q006]. What will be the output of the following program :
void main()
{
printf("%f",123.);
}
(a)123 (b)Compile-Time Error (c)123.00 (d)123.000000
Ans. (d)
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[Q007]. What will be the output of the following program :
void main()
{
printf("%d",sizeof(integer));
}
(a)2 (b)Compile-Time Error (c)4 (d)None of these
Ans. (b) since there is no such data type called 'integer'.
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[Q008]. What will be the output of the following program :
void main()
{
char str[]="C For Swimmers";
printf("%d",sizeof str);
}
(a)14 (b)Compile-Time Error (c)15 (d)None of these
Ans. (a)
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[Q009]. What will be the output of the following program :
void main()
{
char str[]="C For Swimmers";
printf("%d",++(sizeof(str)));
}
(a)14 (b)Compile-Time Error (c)15 (d)None of these
Ans. (b)
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[Q010]. What will be the output of the following program :
void main()
{
char str[]="C For Swimmers";
printf("%d",-sizeof(str));
}
(a)14 (b)Compile-Time Error (c)-15 (d)-14
Ans. (d)
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[Q011]. What will be the output of the following program :
void main()
{
printf("%d",!(100==100)+1);
}
(a)100 (b)0 (c)1 (d)2
Ans. (c)
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[Q012]. What will be the output of the following program :
void main()
{
int x=5,y=6,z=2;
z/=y/z==3?y/z:x*y;
printf("%d",z);
}
(a)Compile-Time Error (b)2 (c)0 (d)1
Ans. (c)
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[Q013]. What will be the output of the following program :
void main()
{
printf("%d %d %d",5,!5,25-!25);
}
(a)5 10 22 (b)5 5 25 (c)5 0 25 (d)5 1 24
Ans. (c)
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[Q014]. What will be the output of the following program :
int main()
{
int a=500,b=100,c=30,d=40,e=19;
a+=b-=c*=d/=e%=5;
printf("%d %d %d %d %d",a,b,c,d,e);
}
(a)500 100 30 40 4 (b)Run-Time Error (c)700 200 300 10 4 (d)300 -200 300 10 4
Ans. (d)
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[Q015]. What will be the output of the following program :
void main()
{
int a=500,b=100,c=30,d=40,e=19;
if ((((a > b) ? c : d) >= e) && !((e <= d) ? ((a / 5) == b) : (c == d)))
printf("Success");
else
printf("Failure");
}
(a)VALID : Success (b)VALID : Failure (c)INVALID (d)None of these
Ans. (a)
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[Q016]. What will be the output of the following program :
void main()
{
int a=1,b=2,c=3,d=4;
printf("%d",!a?b?!c:!d:a);
}
(a)1 (b)2 (c)3 (d)4
Ans. (a)
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[Q017]. What will be the output of the following program :
void main()
{
int i=12345,j=-13579,k=-24680;
long ix=123456789;
short sx=-2222;
unsigned ux=5555;
printf("\n%d %d %d %ld %d %u",i,j,k,ix,sx,ux);
printf("\n\n%3d %3d %3d\n%3ld %3d %3u",i,j,k,ix,sx,ux);
printf("\n\n%8d %8d %8d\n%15ld %8d %8u",i,j,k,ix,sx,ux);
printf("\n\n%-8d %-8d\n%-8d %-15ld\n%-8d %-8u",i,j,k,ix,sx,ux);
printf("\n\n%+8d %+8d\n%+8d %+15ld\n%+8d %8u",i,j,k,ix,sx,ux);
printf("\n\n%08d %08d\n%08d %015ld\n%08d %08u",i,j,k,ix,sx,ux);
}
Ans. 12345 -13579 -24680 123456789 -2222 5555

12345 -13579 -24680
123456789 -2222 5555

12345 -13579 -24680
123456789 -2222 5555

12345 -13579
-24680 123456789
-2222 5555

+12345 -13579
-24680 +123456789
-2222 5555

00012345 -0013579
-0024680 000000123456789
-0002222 00005555
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[Q018]. What will be the output of the following program :
void main()
{
int i=12345,j=0xabcd9,k=077777;
printf("%d %x %o",i,j,k);
printf("\n%3d %3x %3o",i,j,k);
printf("\n%8d %8x %8o"i,j,k);
printf("\n%-8d %-8x %-8o",i,j,k);
printf("\n%+8d %+8x %+8o",i,j,k);
printf("\n%08d %#8x %#8o",i,j,k);
}
Ans. 12345 abcd9 77777
12345 abcd9 77777
12345 abcd9 77777
12345 abcd9 77777
+12345 abcd9 77777
00012345 0xabcd9 077777
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[Q019]. What will be the output of the following program :
void main()
{
char c1='A', c2='B', c3='C';
printf("%c %c %c",c1,c2,c3);
printf("\n%c%c%c",c1,c2,c3);
printf("\n%3c %3c %3c",c1,c2,c3);
printf("\n%3c%3c%3c",c1,c2,c3);
printf("\nc1=%c c2=%c c3=%c",c1,c2,c3);
}
Ans. A B C
ABC
A B C
A B C
c1=A c2=B c3=C
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[Q020]. What will be the output of the following program :
void main()
{
float a=2.5, b=0.0005, c=3000.;
printf("%f %f %f",a,b,c);
printf("\n%3f %3f %3f",a,b,c);
printf("\n%8f %8f %8f",a,b,c);
printf("\n%8.4f %8.4f %8.4f",a,b,c);
printf("\n%8.3f %8.3f %8.3f",a,b,c);
printf("\n%e %e %e",a,b,c);
printf("\n%3e %3e %3e",a,b,c);
printf("\n%12e %12e %12e",a,b,c);
printf("\n%8.2e %8.2e %8.2e",a,b,c);
printf("\n%-8f %-8f %-8f",a,b,c);
printf("\n%+8f %+8f %+8f",a,b,c);
printf("\n%08f %08f %08f",a,b,c);
printf("\n%#8f %#8f %#8f",a,b,c);
printf("\n%g %g %g",a,b,c);
printf("\n%#g %#g %#g"a,b,c);
}

Ans. 2.500000 0.000500 3000.000000
2.500000 0.000500 3000.000000
2.500000 0.000500 3000.000000
2.5000 0.0005 3000.0000
2.500 0.001 3000.000
2.500000e+000 5.000000e-004 3.000000e+003
2.500000e+000 5.000000e-004 3.000000e+003
2.500000e+000 5.000000e-004 3.000000e+003
2.5000e+000 5.0000e-004 3.0000e+003
2.50e+000 5.00e-004 3.00e+003
2.500000 0.000500 3000.000000
+2.500000 +0.000500 +3000.000000
2.500000 0.000500 3000.000000
2.500000 0.000500 3000.000000
2.5 0.0005 3000
2.500000 0.000500 3000.000000
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[Q021]. What will be the output of the following program :
void main()
{
char str[]="C For Swimmers";
printf("%s",str);
printf("\n%.5s",str);
printf("\n%8.*s",5,str);
printf("\n%-10s %.1s",str+6,str);
}
Ans. C For Swimmers
C For
C For
Swimmers C
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[Q022]. What will be the output of the following program :
void main()
{
int a=1,b=2,c=3;
scanf("%d %*d %d",&a,&b,&c);
printf("a=%d b=%d c=%d",a,b,c);
}
[NOTE : 3 values entered by the user are:100 200 300]
(a)1 2 3 (b)100 200 300 (c)100 200 3 (d)100 300 3
Ans. (d)
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[Q023]. What will be the output of the following program :
void main()
{
char line[80]; // Max. length=80 Chars
scanf("%[^,]s",line);
printf("\n%s",line);
}
[NOTE : THE USER INPUT IS:Dear Friends, What is the output?]
(a)Compile-Time Error (b)Dear Friends (c)What is the output? (d)None of these
Ans. (b)
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[Q024]. What will be the output of the following program :
void main()
{
char a,b,c;
scanf("%c%c%c",&a,&b,&c);
printf("a=%c b=%c c=%c",a,b,c);
}
[NOTE : THE USER INPUT IS :A B C]
(a)a=A b=B c=C (b)a=A b= c=B (c)a=A b= c=C (d)None of these
Ans. (b)
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[Q025]. What will be the output of the following program :
void main()
{
int i=1;
float f=2.25;
scanf("%d a %f",&i,&f);
printf("%d %.2f",i,f);
}
[NOTE : THE USER INPUT IS:5 5.75]
(a)1 2.25 (b)5 5.75 (c)5 2.25 (d)None of these
Ans. (c)
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[Q026]. What will be the output of the following program :
void main()
{
char a,b,c;
scanf("%c %c %c",&a,&b,&c);
printf("a=%c b=%c c=%c",a,b,c);
}
[NOTE : THE USER INPUT IS :ABC DEF GHI]
(a)a=ABC b=DEF c=GHI (b)a=A b=B c=C (c)a=A b=D c=G (d)None of these
Ans.
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[Q027]. What will be the output of the following program :
void main()
{
char a[80],b[80],c[80];
scanf("%1s %5s %3s",a,b,c);
printf("%s %s %s",a,b,c);
}
[NOTE : THE USER INPUT IS:CMeansSea Ocean Vast]
(a)C O V (b)C Means Sea (c)C Ocean Vas (d)None of these
Ans. (b)
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[Q028]. What will be the output of the following program :
void main()
{
int a,b,c;
scanf("%1d %2d %3d",&a,&b,&c);
printf("Sum=%d",a+b+c);
}
[NOTE : THE USER INPUT IS :123456 44 544]
(a)Sum=480 (b)Sum=594 (c)Sum=589 (d)None of these
Ans. (a)
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[Q029]. What happens when the following program is executed :
void main()
{
char line[80];
scanf("%[^1234567890\n]",line);
}
(a)Accepts the string that contains DIGITS only.
(b)Accepts the string that contains DIGITS and NEWLINE characters.
(c)Accepts the string that contains anything other than the DIGITS and NEWLINE characters.
(d)None of these
Ans. (c)
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[Q030]. What happens when the following program is executed :
void main()
{
char line[80];
scanf("%[^*]",line);
}
(a)Accepts the string that contains DIGITS & ALPHABETS only.
(b)Accepts the string that contains * or asterisk characters only.
(c)Accepts the string that contains anything other than the * or asterisk character.
(d)None of these
Ans. (c)
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