//Downloaded From theonlinetutorials.com

//C Program to convert the lower case letters to upper case and vice-versa 

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

void main()
{
char sentence[100];
int count, ch, i;
clrscr();

printf("Enter a sentence\n");
for(i=0; (sentence[i] = getchar())!='\n'; i++)
{
;
}
count = i;

printf("\nInput sentence is     : %s ",sentence);

printf("\nResultant sentence is : ");
for(i=0; i < count; i++)
{
ch = islower(sentence[i]) ? toupper(sentence[i]) : tolower(sentence[i]);
putchar(ch);
}

}     /*End of main()

/*-----------------------------------------
Output
Enter a sentence
gOOD mORNING

Input sentence is     : gOOD mORNING

Resultant sentence is :Good Morning
------------------------------------------*/

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Tagged as: C Program to convert the lower case letters to upper case and vice-versa, convert the lower case letters to upper case and vice-versa