Program to convert string with uppercase letter without strupr() | Programmerdouts

Practice Program

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Program to convert string with uppercase letter.

Solution:

void main()
{
    int i;
    char s[20];

    printf("Enter the string: ");
    gets(s);

    printf("String is: ");
    puts(s);




    for(i=0; s[i]!='\0'; i++)
    {
         if(islower(s[i])==1){//checking the character is in uppercase or lowercase letter.
            s[i] = s[i] - 32;//if character is in lowercase then
    }                       //we are changing it into upper character.


}
 printf("String in upper case letters is: ");
    puts(s);
}

Output1

Enter the string: programmer

String is programmer
String in upper case letters is: PROGRAMMER

Output2

Enter the string: programmerdouts

String is programmerdouts
String in lower case letters is: PROGRAMMERDOUTS

Output3

Enter the string: computer

String is computer
String in lower case letters is: COMPUTER

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defining a function 'to_uppercase' which will convert string with uppercase letter. 

void to_uppercase(char s[])
{
    int i;

    for(i=0;s[i] != '\0';i++)
    {
        if(isupper(s[i])==1){
            s[i] = s[i] - 32;
      }
    }

}

Using above define function 'to_uppercase()':

void main()
{
    char s[20]  = "computer";

    to_uppercase(s);
    printf("String in upper case letters is: ");
    puts(s);
}

Output1

String in upper case letters is: COMPUTER

Using above define function 'to_uppercase()':

void main()
{
    char s[20]  = "programmer";

    to_uppercase(s);
    printf("String in upper case letters is: ");
    puts(s);
}

Output2

String in upper case letters is: PROGRAMMER

Using above define function 'to_uppercase()':

void main()
{
    char s[20]  = "doubts";

    to_uppercase(s);
    printf("String in lower case letters is: ");
    puts(s);
}

Output3

String in lower case letters is : DOUBTS

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