01: #include <stdio.h>
02:
03: int main(void)
04: {
05: char str[20];
06: int i;
07:
08: printf("Input: ");
09: scanf("%s", str);
10: for(i = 0;str[i] != '\0';i++)
11: {
12: if('A' <= str[i] && str[i] <= 'Z')
13: {
14: str[i] = str[i] - 'A' + 'a';
15: }
16: }
17: printf("%s\n", str);
18: return 0;
19: }