This C program is used to change string case with and without using strlwr and strupr functions.
Lowercase using strlwr function
Program:
#include <stdio.h>
#include <string.h>
int main()
{
char string[] = "Strlwr in C";
printf("%s\n",strlwr(string));
return 0;
}Uppercase using strupr function
Program:
#include <stdio.h>
#include <string.h>
int main()
{
char string[] = "strupr in c";
printf("%s\n",strupr(string));
return 0;
}Lowercase without strlwr function
Program:
#include <stdio.h>
void lower_string(char*);
int main()
{
char string[100];
printf("Enter a string to convert it into lower case\n");
gets(string);
lower_string(string);
printf("Entered string in lower case is \"%s\"\n", string);
return 0;
}
void lower_string(char *string)
{
while(*string)
{
if ( *string >= 'A' && *string <= 'Z' )
{
*string = *string + 32;
}
string++;
}
}Uppercase without strupr function
Program:
#include <stdio.h>
void upper_string(char*);
int main()
{
char string[100];
printf("Enter a string to convert it into upper case\n");
gets(string);
upper_string(string);
printf("Entered string in upper case is \"%s\"\n", string);
return 0;
}
void upper_string(char *string)
{
while(*string)
{
if ( *string >= 'a' && *string <= 'z' )
{
*string = *string - 32;
}
string++;
}
}