C-Programming Tutorials

C Program to Change String Case

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++;            

}

}

 

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