Answer Posted / vadivelt

The ans without using lib function tolower() & toupper()

#include<stdio.h>
#include<conio.h>
void LowrUprCase(char *ptr);
int main()
{
char ptr[100];
printf("ENTER THE NAME:\n");
gets(ptr);
LowrUprCase(ptr);
printf("\nOUTPUT: %s \n",ptr);
getch();
}

void LowrUprCase(char *ptr)
{
while(*ptr != '\0')
{
if(*ptr >= 97 && *ptr <= 122)
{
*ptr = *ptr - 32;
}

else if(*ptr >= 65 && *ptr <= 90)
{
*ptr = *ptr + 32;
}
ptr++;
}
}

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