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To convert lower case into uppercase and vice-versa of string:

#include<stdio.h>
#include<conio.h>
#include<string.h>
void main()
{
char str[20];
int i;
clrscr();
gets(str);
for(i=0;str[i]!='\0';i++)
{
if(str[i]>=65&&str[i]<=90)
str[i]=str[i]+32;
else if(str[i]>=97&&str[i]<=122)
str[i]=str[i]-32;
}
puts(str);
getch();
}

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