K & R C Programs Exercise 7-1.

K and R C, Solution to Exercise 7-1:
K and R C Programs Exercises provides the solution to all the exercises in the C Programming Language (2nd Edition). You can learn and solve K&R C Programs Exercise.
Write a C program that converts upper case to lower case or lower case to upper, depending on the name it is invoked with, as found in argv[0]. Read more about C Programming Language .

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#include<stdio.h>
#include<ctype.h>
#include<string.h>

//lower: converts upper case to lower case
//upper:converts upper case to lower case

main(int argc, *argv[])
{
int c;
if(strcmp(argv[0],"lower") == 0)
while((c = getchar()) != EOF)
putchar(tolower(c)) != EOF)
else
while(c = getchar()) != EOF)
putchar(toupper(c));
return 0;
}

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K & R C Programs Exercise 2-10.

K and R C, Solution to Exercise 2-10:
K and R C Programs Exercises provides the solution to all the exercises in the C Programming Language (2nd Edition). You can learn and solve K&R C Programs Exercise.
C Function lower, which converts the lower case, with a conditional expression instead of if-else.Read more about C Programming Language .

/***********************************************************
* You can use all the programs on www.c-program-example.com
* for personal and learning purposes. For permissions to use the
* programs for commercial purposes,
* contact [email protected]
* To find more C programs, do visit www.c-program-example.com
* and browse!
*
* Happy Coding
***********************************************************/

int lower(int c)
{
return c >= 'A' && c<= 'Z' ? c + 'a' - 'A': c;
}
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