Thread: FOR cycle problem

Still gives me wrong result (always 96) and yes, i had to write an own power, cuz cannot use math.h:

Code:

#include <stdio.h>


int hatvany(int alap, int exp)
{
    int res = 1;
    for (;;)
    {
        if (exp & 1)
            res *= alap;
        exp >>= 1;
        if (!exp)
            break;
        alap *= alap;
    }


    return res;
}




int main(void) {


    char op;
	int num1, num2, kitevo;
    int res;
	int i;


	FILE* fp = fopen ("be.txt", "r");
	FILE*  outfile = fopen("ki.txt", "w");
    fprintf(outfile, "%d\n", res);




	while (fscanf(fp, "%c%d%d%d\n", &op, &num1, &num2, &kitevo) == 4) {


		switch (op) {


            case '+' :


                 for (int i = num1; i <= num2; i++);
		         {
		             res += hatvany(i, kitevo);


		         }
		         break;
            case '*' :


		         for (int i = num1; i <= num2; i++);
		         {
		             res *= hatvany(i, kitevo);
		         }


             break;


		}




    }


    	return 0;
}