编程实现统计一行字符串中大小写字母，数字的个数

直接上代码

#include<strings.h>
int main()
{
int big = 0;
int small = 0;
int space = 0;
int number = 0;
int others = 0;
printf("please input a str:\n");
char a[50];
fgets(a,50,stdin); //stdin 意思是键盘输入
//gets从终端读入是的字符串是用\0结束的，而fgets是以\n结束的
//这里用gets出现空格字符串输入就会结束，导致无法统计空格
int i = 0;
int len;
len = strlen(a);
for(i = 0;i<len;i++)
{
if((a[i] >= 'A') && (a[i] <= 'Z'))
big++;
else if((a[i] >= 'a') && (a[i] <= 'z'))
small++;
else if((a[i] >= '0') && (a[i] <= '9'))
number++;
else if(a[i] == ' ')
space++;
else
others++; //结尾符\0算other
}
printf("big=%d\nsmall=%d\nspace=%d\nnumber=%d\nothers=%d\n",big,small,space,number,others);
return 0;
}