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int main(void) {
	// your code goes here
 
	int a=0;
	while(a<5){
		printf("Hello World!%d/n",a);
        num++; 
	}
	return 0;
}

prog.c: In function ‘main’:
prog.c:6:3: warning: implicit declaration of function ‘printf’ [-Wimplicit-function-declaration]
   printf("Hello World!%d/n",a);
   ^~~~~~
prog.c:6:3: warning: incompatible implicit declaration of built-in function ‘printf’
prog.c:6:3: note: include ‘<stdio.h>’ or provide a declaration of ‘printf’
prog.c:7:9: error: ‘num’ undeclared (first use in this function)
         num++;
         ^~~
prog.c:7:9: note: each undeclared identifier is reported only once for each function it appears in

Standard output is empty