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What will be the output of the program in 16 bit platform (Turbo C under DOS)?

#include<stdio.h>
int main()
 {
     int fun();
     int i;
     i = fun();
     printf("%d\n", i);
     return 0;
 }
 int fun()
 {
     _AX = 1990;
 }

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1) What will be the output of the program?

#include<stdio.h>
int fun(int);
int main()
 {
     float k=3;
     fun(k=fun(fun(k)));
     printf("%f\n", k);
     return 0;
 }
int fun(int i)
 {
     i++;
     return i;
 }

2) Point out the error in the program

   f(int a, int b)
 {
     int a;
     a = 20;
     return a;
 }

					  

3) What will be the output of the program?

#include<stdio.h>
int fun(int, int);
 typedef int (*pf) (int, int);
 int proc(pf, int, int);
int main()
 {
     printf("%d\n", proc(fun, 6, 6));
     return 0;
 }
 int fun(int a, int b)
 {
    return (a==b);
 }
int proc(pf p, int a, int b)
 {
    return ((*p)(a, b));
 }

4) Which library function returns number of seconds elapsed beyond a designated base time?

5) The keyword used to transfer control from a function back to the calling function is