This is a C program to replace lowercase characters by uppercase & vice-versa.
This program accepts the sentence and replaces lowercase characters by uppercase & vice-versa.
1. Take the sentence as input.
2. Using (islower()? toupper():tolower()) function replace lowercase characters by uppercase & vice-versa.
3. Print the output and exit.
Here is source code of the C program to replace lowercase characters by uppercase & vice-versa. The C program is successfully compiled and run on a Linux system. The program output is also shown below.
/*
* C program to read an English sentence and replace
* lowercase characters by uppercase and vice-versa.
* Output the given sentence as well as the converted
* sentence on two different lines.
*/
#include <stdio.h>
#include <ctype.h>
void main()
{
char sentence[100];
int count, ch, i;
printf("Enter a sentence \n");
for (i = 0;(sentence[i] = getchar()) != '\n'; i++)
{
;
}
sentence[i] = '\0';
/* shows the number of chars accepted in a sentence */
count = i;
printf("The given sentence is : %s", sentence);
printf("\n Case changed sentence is: ");
for (i = 0; i < count; i++)
{
ch = islower(sentence[i])? toupper(sentence[i]) :
tolower(sentence[i]);
putchar(ch);
}
}
1. Take an an English sentence as input and store it in the array sentence[].
2. Copy the last letter’s position in the array to the variable count.
3. Using for loop and (islower()? toupper():tolower()) function replace lowercase characters by uppercase & vice-versa. Store this in the variable ch.
4. Print the variable ch as output and exit.
Enter a sentence wELCOME tO sANFOUNDRY The given sentence is : wELCOME tO sANFOUNDRY Case changed sentence is: Welcome To Sanfoundry
Sanfoundry Global Education & Learning Series – 1000 C Programs.
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