C Fundamentals

Data Types, Constants & Variables, Playing with scanf function, Operators & Expressions

[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

 [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) ' '

[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/-"

[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

[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

[Q006] What will be the output of the following program :

 int main()
   {
     char str[]="C For Swimmers";
     printf("%d",sizeof str);
     return(0);
   }

 (a)2
 (b)Compile-Time Error
 (c)4
 (d)None of these

[Q007] What will be the output of the following program :
int main()
 {
   printf("%d",sizeof(integer));
   return(0);
 }

 (a)2
 (b)Compile-Time Error
 (c)4
 (d)None of these

[Q008] What will be the output of the following program :
int main()
 {
   char str[]="C For Swimmers";
   printf("%d",sizeof str);
   return(0);
 }

 (a)14
 (b)Compile-Time Error
 (c)15
 (d)None of these

[Q009] What will be the output of the following program :

int main()
   {
    char str[]="C For Swimmers";
    printf("%d",++(sizeof(str)));
    return(0);
  }

 (a)14
 (b)Compile-Time Error
 (c)15
 (d)None of these

 [Q010] What will be the output of the following program :
 int main()
   {
    char str[]="C For Swimmers";
    printf("%d",-sizeof(str));
    return(0);
  }

 (a)14
 (b)Compile-Time Error
 (c)-15
 (d)-14

[Q011] What will be the output of the following program :

int main()
    {
     printf("%d",!(100==100)+1);
     return(0);
    }

[Q012] What will be the output of the following program :
 int main()
   {
    int x=5,y=6,z=2;
    z/=y/z==3?y/z:x*y;
    printf("%d",z);
    return(0);
  }

(a)Compile-Time Error
 (b)2
 (c)0
 (d)1

[Q013] What will be the output of the following program :
int main()
 {
   printf("%d %d %d",5,!5,25-!25);
   return(0);
 }

 (a)5 10 22
 (b)5 5 25
 (c)5 0 25
 (d)5 1 24

[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);
   return(0);
 }

 (a)500 100 30 40 4
 (b)Run-Time Error
 (c)700 200 300 10 4
 (d)300 -200 300 10 4

[Q015] What will be the output of the following program :
int 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");
   return(0);
 }

 (a)Success
 (b)Failure
 (c)Invalid Statement(s)
 (d)None of these

[Q016] What will be the output of the following program :
 int main()
 {
   int a=1,b=2,c=3,d=4;
   printf("%d",!a?b?!c:!d:a);
   return(0);
 }

 (a)1
 (b)2
 (c)3
 (d)4

[Q020] What will be the output of the following program :
int 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);
   return(0);
 }

[Q021] What will be the output of the following program :
int 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);
   return(0);
 }

 [Q022] What will be the output of the following program [NOTE : 3 values entered by the user are:100 200 300] :

int 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);
   return(0);
 }

Solutions for the above queries.