Exercise 7.1 - upper case to lower or lower case to upper¶
Question¶
Write a program that converts upper case to lower or lower case to upper, depending on the name it is invoked with, as found in argv[0]
/* Write a program which converts upper case to lower case or lower case to
upper case depending on the name it is involved with as found in argv[0] */
#include <ctype.h>
#include <stdio.h>
#include <string.h>
/* lower: converts upper case to lower case */
/* upper: converts lower case to upper case */
int main(int argc, char *argv[]) {
int c;
if (strcmp(argv[0], "./lower") == 0)
while ((c = getchar()) != EOF)
putchar(tolower(c));
else
while ((c = getchar()) != EOF)
putchar(toupper(c));
return 0;
}