Behaviour of COMMA operator in C

#include < stdio.h >   int main() {     int i, j;     int p = 0, q = 2;     for(i = 0, j = 0; i < p, j < q; i++, j++)     {       printf("GeeksforGeeks\n");     }     return 0; }

Output:

GeeksforGeeks
GeeksforGeeks

Following is the main expression to consider in the above program.

i < p, j < q

When two expressions are separated by comma operator, the first expression (i < p) is executed first. Result of the first expression is ignored. Then the second expression (j < q) is executed and the result of this second expression is the final result of the complete expression (i < p, j < q). The value of expression 'j < q' is true for two iterations, so we get "GeeksforGeeks" two times on the screen.