Answer Posted / vishnu nayak

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

int main()
{
const char *ptr;
char *temp;
int count =0;
ptr = (char*) malloc(sizeof(char)*30);
temp = (char*) malloc(sizeof(char)*30);
printf("enter the string \n");
gets(ptr);
while(*ptr != '\0')
{
if(*ptr >=65 && *ptr <= 90)
{
*temp = (*ptr)+32;
temp++;
ptr++;
}
else if(*ptr >= 97 && *ptr <= 122)
{
*temp = (*ptr)- 32;
temp++;
ptr++;
}
else
{
*temp = *ptr;
ptr++;
temp++;
}
count++;
}
*temp = '\0';
temp = temp - count;
puts(temp);

free(temp);
free(ptr);

//getch();
}

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