接下来的程序是识别字符串中的字母，数字和特殊字符的总数-
#include<stdio.h>
#include<ctype.h>
void main(){
//Declaring integer for number determination, string//
int number;
char string[50];
int alphabets=0;
int digits=0;
int special=0;
//Reading User I/p//
printf("输入字符串：");
gets(string);
for(number=0;string[number]!='\0';number++){
if(string[number]>='a'&&string[number]<='z'||string[number]>='A'&&string[number]<='Z'){
alphabets=alphabets+1;
//alphabets++;
}else if(string[number]>='0'&&string[number]<='9'){
digits=digits+1;
//digits++;
}else{
special=special+1;
//special++;
}
}
//Printing number of alphabets, number of digits, number of special characters//
printf("The number of alphabets in the string is : %d\n",alphabets);
printf("The number of digits in the string is : %d\n",digits);
printf("The number of special characters in the string is : %d\n",special);
}输出结果输入字符串：The number of alphabets in the string is : 0 The number of digits in the string is : 0 The number of special characters in the string is : 1