Practice Program






  • Program to Reverse a string.

    • Solution: 
    void main()
{   char ch,s[20];
   //storing length of string in variable l.
    int i;

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

 int l = strlen(s);


    for(i=0; i<(l/2); i++)
    {
        ch = s[i];  //at every iteration we swapping character at i index
        s[i] = s[(l-1)-i]; //with character at index ((l-1)-i)
        s[(l-1)-i] = ch;
    }

    printf("Reverse string is: ");
    puts(s);
}

    Output1
    Enter the string: programmerdouts

    Reverse string is: stuodremmargorp

    Output2
    Enter the string: programmer

    Reverse string is: remmargorp

    Output3
    Enter the string: Hello

    Reverse string is: olleH






    defining a function 'reverse' which will reverse a  string. 

    void reverse(char s[])
{   int l = strlen(s);//storing length of string in variable l.
 int i;

 char ch;
    for(i=0; i<(l/2); i++)
    {
        ch = s[i];  //at every iteration we swapping character at i index
        s[i] = s[(l-1)-i]; //with character at index ((l-1)-i)
        s[(l-1)-i] = ch;
    }
}

    Using above define function 'reverse()': 
    void main()
{
    char s[20] = "programmerdoutsa";

    reverse(s);
    printf("Reverse string is: ");
    puts(s);

}

    Output1
    Reverse string is: stuodremmargorp

    Using above define function 'reverse()': 
    void main()
{
    char s[20] = "programmer";

   reverse(s);

    puts(s);

}

    Output2
    Reverse string is: remmargorp

    Using above define function 'reverse()': 
    void main()
{
    char s[20] = "Hello";

    reverse(s);

    puts(s);

}

    Output3
    Reverse string is: olleH