/* 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<stdio.h>
#include<string.h>
#include<ctype.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;
}
 
 

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