pat1021：个位数统计

https://www.patest.cn/contests/pat-b-practise/1021

#include "stdio.h"#include "string.h"int main(){int i, len, a[10] = {0};char num[1000];scanf("%s", num);len = strlen(num);for(i = 0; i < len; ++i){switch(num[i]){case '0': ++a[0]; break;case '1': ++a[1]; break;case '2': ++a[2]; break;case '3': ++a[3]; break;case '4': ++a[4]; break;case '5': ++a[5]; break;case '6': ++a[6]; break;case '7': ++a[7]; break;case '8': ++a[8]; break;case '9': ++a[9]; break;default: break;}}for(i = 0; i < 10; ++i)if(a[i] > 0)printf("%d:%d\n", i, a[i]);return 0;}