YHYKnb - Online C Compiler & Debugging Tool

#include <stdio.h>
#include <stdlib.h>

int main(void) {
  int ninzu[15];
  int kuwake[10] = {0};
  int i, rank;

  for (i = 0; i < 15; i++) {
    ninzu[i] = rand() % 101;
    if (ninzu[i] == 100) {
      rank = 9;
    } else {
      rank = ninzu[i] / 10;
    }
    kuwake[rank]++;
  }

  for (i = 0; i < 10; i++) {
    int lower = i * 10;
    int upper = (i == 9) ? 100 : (i * 10 + 9);
    printf("%3d：%3d: ", lower, upper);
    for (int j = 0; j < kuwake[i]; j++) {
      printf("*");
    }
    printf("\n");
  }

  printf("\n15人分の点数\n");
  for (i = 0; i < 15; i++) {
    printf("%3d ", ninzu[i]);
  }

  return 0;
}