I think the reason is that your function is returning nothing or has nothing to return try this ;
#include <stdio.h>void fun( int, int);int main(){ int i=5,j=2; fun(i,j); return 0;} void fun(int i, int j){ i = i*i; j = j*j;
printf("%d %j",i,j);}
#include <stdio.h>void fun( int *p, int *q);int main(){ int i=5,j=2; fun(&i,&j); printf("%d %d\n",i,j); return 0;} void fun(int *p, int *q){ *p = (*p)*(*p); *q = (*q)*(*q);}
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