[编程入门]字符串分类统计-题解(C语言代码)

#include <stdio.h>
int main()
{
	int letter = 0, number = 0, kongge = 0, other = 0;
	char ch = 0;
	while (ch != '\n')
	{
		ch = getchar();
		if (ch >= 'a' && ch <= 'z' || ch >= 'A' && ch <= 'Z')  letter++;
		else if (ch >= '0' && ch <= '9') number++;
		else if (ch == ' ')  kongge++;
		else other++;
	}
	printf("%d %d %d %d ", letter, number, kongge, other);
	return 0;
}

#include<stdio.h>
int main()
{
	char x[200];
	int i;
	int a[4]={0};
	gets(x);
	int len=strlen(x);
	
	for(i=0;i<len;i++)
	{
	    
	    if((x[i]>='A'&&x[i]<='Z')||(x[i]>='a'&&x[i]<='z'))
	    a[0]++;
	    else if(x[i]>='0'&&x[i]<='9')
	    a[1]++;
	    else if(x[i]==' ')
	    a[2]++;
	    else 
	    a[3]++;
	}
	for(i=0;i<4;i++)
	printf("%d ",a[i]);
	return 0;
}

#include<stdio.h>
#include<string.h>
int main()
{
char a[200];
	int i,b=0,c=0,d=0,e=0;
	scanf("%s",&a);
	for(i=0;a[i]<=strlen(a);i++)
	{
		if((a[i]<=90&&a[i]>=65)||(a[i]>=97&&a[i]<=122))
		b++;
		else if(a[i]<=57&&a[i]>=48)
		c++;
		else if(a[i]==32)
		d++;
		else
		e++;
	}
	printf("%d %d %d %d",b,c,d,e);
	return 0;
}

思路差不多

#include<stdio.h>
main()
{
    char str[100];
    int i,letter=0,number=0,space=0,other=0;
    gets(str);
    for(i=0;i<strlen(str);i++)
    {
        if(str[i]>='a'&&str[i]<='z'||str[i]>='A'&&str[i]<='Z')
            letter++;
        else if(str[i]>='0'&&str[i]<='9')
            number++;
        else if(str[i]==' ')
            space++;
        else
            other++;
    }
    printf("%d %d %d %d",letter,number,space,other);
    return 0;
}

#include<string.h>
int main()
{
	int a = 0;
	int j = 0;
	int k = 0;
	int m = 0;
	int b = 0;
	int i = 0;
	char arr[200]={};
	gets(arr);
	//scanf("%s", &arr);scanf竟然不能输入空格
	a = strlen(arr);
	for (i = 0; i <= a; i++)
	{
		int n = arr[i];
		if (n > 64 && n < 91)
			j++;
		else if (n > 96 && n < 123)
			j++;
		else if (n >=48 && n <=57)
			k++;
		else if (n == 32)
			m++;
		else
			b++;
	}
	printf("%d %d %d %d", j, k, m, b-1);

	return 0;
}