2) Write a program to change the case of each character of the string.

 

source file name: string1.C

#include<stdio.h>

#include <stdio.h>

int  main()

{

int i=0;

char str[30],ch;

//clrscr();

printf("Input a string\n");

gets(str);

while(str[i]!='\0')

{

ch=str[i];

if(ch>='A'&&ch<='Z')

{

str[i]=str[i]+32;

}

else

{

if(ch>='a'&&ch<='z')

str[i]=str[i]-32;

}

i++;

}

printf("%s\n",str);

//getch();

return 0;

}

 

Output:

Input a string

THIS Is a C Program

this iS a c pROGRAM