[c/cpp]：字母大小写转换

[c/cpp]：字母大小写转换

 

 

 

 

一、代码

#include <iostream>
#include <string>
#include <vector>


char ip1[] = "01234567890AbcDEf";
char ip2[] = "01234567890AbcDEf";


// convert lower character to upper character(A-Z)
void l2u(char *p)
{
    
    // berfore:
    std::cout << "\t[in]#\t" << p << std::endl;
    
    char *x=p;
    for (; *x!='\0'; x++) {
        if (*x>=97 && *x<=122) {
            *x -= 32;    
        }    
    }
    
    // after
    std::cout << "\t[out_upper]#\t" << p << std::endl;
}


// convert upper character to lower character(a-z)
void u2l(char *p)
{
    
    // berfore:
    std::cout << "\t[in]#\t" << p << std::endl;
    
    char *x=p;
    for (; *x!='\0'; x++) {
        if (*x>=65 && *x<=90) {
            *x += 32;    
        }    
    }
    
    // after
    std::cout << "\t[out_lower]#\t" << p << std::endl;
}


// test part
int main()
{
    // convert input characters to upper characters
    l2u(ip1);
    
    // convert input characters to lower characters
    u2l(ip2);
    
    return 0 ;
}

 

 

 

二、运行结果

    [in]#    01234567890AbcDEf
    [out_upper]#    01234567890ABCDEF
    [in]#    01234567890AbcDEf
    [out_lower]#    01234567890abcdef

 

 

 

三、参考资料及工具

 

　　1、　　cpp在线编译工具　　-　　https://coliru.stacked-crooked.com/