编程学习网为您整理以下代码实例，主要实现：转换字母为大小写，希望可以帮到各位朋友。
#include <stdio.h>
int main(voID){
char letter = 0; // Stores a character
printf("Enter an uppercase letter:"); // Prompt for input
scanf("%c", &letter); // Read a character
// Check whether the input is uppercase
if(letter >= 'A') // Is it A or greater?
if(letter <= 'Z') // and is it Z or lower?
{ // It is uppercase
letter = letter - 'A' + 'a'; // Convert from upper- to lowercase
printf("You entered an uppercase %c\n", letter);
}
else // It is not an uppercase letter
printf("Try using the shift key! I want a cAPItal letter.\n");
return 0;
}
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