用go语言实现，判断一个程序是否为小写字母，如果是，就转换成大写字母，否则，不转换

  这种题目相对简单，用C语言实现很好理解。

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//用C语言实现：判断一个程序是否为小写字母，如果是，就转换成大写字母，否则，不转换
#include

using namespace std;

int main(void) {
    char c;

    cout << "请输入一个字符: " << endl;
    cin >> c;

    if (c >= 'a' && c <= 'z') {  //判断是否为小写字母，。，，，利用ASCLL码表
        c = c - 32;   //转换成大写
    }
    else if (c >= 'A' && c <= 'Z') { //判断是否为大写字母
        c = c + 32;   //转换成小写
    }

    cout << c << endl;

   
    system("pause");
    return 0;
}

用go语言实现的两种方法

package main

import(
	"fmt"
)

func main(){
	var x string
	fmt.Println("请输入字符：")
	fmt.Scanln(&x)
	t:= snfn(x)
	fmt.Println(t)
}

func snfn(x string)string{
	c := rune(x[0])
	c -= 32
	return string(c)
}

package main

import "fmt"

func main(){
	for {
		var x string
		fmt.Println("请输入一个字符:")
		fmt.Scanln(&x)

		t := converSion(x)
		fmt.Println(t)
	}
}

func converSion(a string) string  {
	var ay = []string{"a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z"}
	var ay2 = []string{"A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V","W","X","Y","Z"}
	for k, v := range ay{
		if v == a{
			a = ay2[k]
		}
	}
	return a
}

//还可以使用strings包中的
//strings.ToLower()
//strings.ToTitle()