#include <stdio.h>

int max_f(int arraies[], int number);

int main(void){

	int su[10] = { 1, 5, 2, 5, 7, 9, 2, 1, 23, 20 };
	int max;

	max = max_f(su, (sizeof(su) / sizeof(su[0])));

	printf("最大値の添え字は%dです\n", max);
	return 0;

}

int max_f(int arraies[], int number){
	int max = -9999, max_n = 0 , i;

	for (i = 0; i < number; i++){
		if (arraies[i]>max){
			max = arraies[i];
			max_n = i;
		}
	}
	return max_n;
}