The keyword used to transfer control from a function back to the calling functio

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

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1) What will be the output of the program?

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

2) What will be the output of the program?

#include<stdio.h>
int sumdig(int);
int main()
{
     int a, b;
     a = sumdig(123);
     b = sumdig(123);
     printf("%d, %d\n", a, b);
     return 0;
 }
int sumdig(int n)
 {
     int s, d;
     if(n!=0)
     {
         d = n%10;
         n = n/10;
         s = d+sumdig(n);
     }
     else
         return 0;
     return s;
 }

3) Point out the error in the program

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

    

4) What will be the output of the program?

#include<stdio.h>
int main()
 {
     int i=1;
     if(!i)
         printf("Study2Online,");
     else
     {
         i=0;
         printf("C-Program");
         main();
     }
     return 0;
 }

5) What will be the output of the program?

#include<stdio.h>
int main()
 {
     int fun(int);
     int i = fun(10);
     printf("%d\n", --i);
     return 0;
 }
int fun(int i)
 {
    return (i++);
 }