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<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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