Previous Next

convert uppercase to lowercase in C

In this program you will learn how you can convert string from uppercase to lowercase, In C language every character represent as a integer value known as ASCII. ASCII value of small letter (a-z) are (97-122) and capital (A-Z) are (65-90)

#include<stdio.h>
void main()
{
 char str[20];
 int i;
 printf("\n enter a string:");
 gets(str);
 for(i=0;str[i]!='\0';i++)
 {
    //it will convert uppercase to lowercase
    if(str[i]>=65 && str[i]<=90)
    {
    	str[i]=str[i]+32;
    }
 }
 printf(" %s",str);
}

output

enter a string:WELCOME TO MY WEBSITE
welcome to my website

working of uppercase to lowercase program in C

input string from the user, and store it some variable let say str
run the loop from 0 till end of string
When you want to change from uppercase to lowercase, you have to add the ASCII value of uppercase letters to 32. why adding it with 32 because diffrence of a-A=32
For example: A+32=a i.e 65+32=97
65 is ASCII value of capital A and 97 is ASCII value of small a

Previous Next

C Program C# program PHP program JavaScript Program