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;
}