Program 238: Convert Upper to Lower and Vice Vesra using Library Functions

Program 238:
 

#include<stdio.h>
#include<string.h>
#include<ctype.h>
main()
{
    int i;
    char str1[100];
    printf("Enter a sentence to convert upper to lower and vice versa\n");
    gets(str1);
for(i=0;i<strlen(str1);i++)
{
    if(islower(str1[i]))
    {
        printf("%c",toupper(str1[i]));
    }
    else if(isupper(str1[i]))
    {
        printf("%c",tolower(str1[i]));
    }
    else
    {
        printf("%c",str1[i]);
    }
}
}

Explanation:

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Output: