Output of C Program | Set 20

Predict the outputs of following C programs.

Question 1

int main() {   int x = 10;   static int y = x;     if(x == y)      printf("Equal");   else if(x > y)      printf("Greater");   else      printf("Less");     getchar();   return 0; }

Output: Compiler Error
In C, static variables can only be initialized using constant literals. See this GFact for details.

Question 2

#include <stdio.h>   int main() {   int i;     for (i = 1; i != 10; i += 2)   {     printf(" GeeksforGeeks ");   }     getchar();   return 0; }

Output: Infinite times GeeksforGeeks

The loop termination condition never becomes true and the loop prints GeeksforGeeks infinite times. In general, if a for or while statement uses a loop counter, then it is safer to use a relational operator (such as <) to terminate the loop than using an inequality operator (operator !=). See this for details.

Question 3

#include<stdio.h> struct st {     int x;     struct st next; };   int main() {     struct st temp;     temp.x = 10;     temp.next = temp;     printf("%d", temp.next.x);       getchar();     return 0; }

Output: Compiler Error
A C structure cannot contain a member of its own type because if this is allowed then it becomes impossible for compiler to know size of such struct. Although a pointer of same type can be a member because pointers of all types are of same size and compiler can calculate size of struct.

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