/* C program to read an English sentence and replace lowercase characters by uppercase and vice-versa. Output the given sentence as well as the case converted sentence on two different lines. */

#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++)
{
;
}

sentence[i]=’\0′;

count = i; /*shows the number of chars accepted in a sentence*/

printf(“The given sentence is   : %s”,sentence);

printf(“\nCase changed 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
My Name is C
The given sentence is : My Name is C
Case changed sentence is: mY nAME IS c
————————————————*/

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Tagged as: C program to read an English sentence and replace lowercase characters by uppercase and vice-versa. Output the given sentence as well as the case converted sentence on two different lines., replace lowercase characters by uppercase and vice-versa. Output the given sentence as well as the case converted sentence on two different lines.