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  • c语言中求字符串的长度

    1、利用数组。

    #include <stdio.h>
    
    int len(char x[])
    {
        int len = 0;
        
        while(x[len])
            len++;
        return len;
    }
    
    int main(void)
    {
        char str[128];
        printf("str = "); scanf("%s", str);
        
        printf("str length: %d
    ", len(str));
        
        return 0;
    }

    2、利用指针

    #include <stdio.h>
    
    int len2(char *x)
    {
        int len = 0;
        
        while(*x++)
            len++;
        return len;
    }
    
    int main(void)
    {
        char str[128];
        printf("str = "); scanf("%s", str);
        
        printf("str length: %d
    ", len2(str));
        
        return 0;
    }

    3、利用字符串处理库函数。

    #include <stdio.h>
    #include <string.h>  // strlen函数的头文件 
    
    int main(void)
    {
        char str[128];
        printf("str = "); scanf("%s", str);
        
        printf("str length: %d
    ", strlen(str));
        return 0;
    }

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  • 原文地址:https://www.cnblogs.com/liujiaxin2018/p/14832068.html
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