Programming Tutorial

Write a program to read a string & convert upper case alphabet to lower case & lower case to upper case.

#include<Stdio.h>

#include<conio.h>

                Main ()

{

                Int len, I;

                Char a [50];

                Printf(“enter a string);

                Gets(a);

                Len= strlen (a);

                For (i=0; i<len; i++)

                {

                If (a[i] >= ‘A’ && a[i]<=’Z’)

                a[i]= toupper (a[i]);

                else if( a[i]>= ‘A’ &&  a[i]<= ‘2’);

                a[i]= tolower(a[i]);

                }

                Print(“The changed string is %”, a);

                }

Write a program to read a string & count number of words.

#include<Stdio.h>

#include<conio.h>

                Main()

{

                Int len, I;

                Char a[50];

                Printf(“enter a string”);

                Gets(a);

                Len = strien(a);

                For (i=0; i<len; i++)

                {

                If (a[i] == 32 && a [i+1]!32)

                Count = count+1;

                }
                printf(“in the number of words = % d”, count + 1);

                }

Finding string length without library function

#include<Stdio.h>

#include<conio.h>

Main()

{

                Int len  0, I;

                Char a[50];

                Printf(“enter a string”);

                Gets(a);

                For (i=0; a[i] = ’\0’, i++)

Len =len +1;

                Printf(“in string length = % d”, len);        

                }

Write a program to copy a string from one array to next without using library function strcpy.

#include<Stdio.h>

#include<conio.h>

Main()

{

                Int len  0, i;

                Char a[50] , b [50];

                Printf(“enter a string”);

                Gets(a);

                For (i=0; a[i] = ’\0’, i++)

Len =len +1;

                For (i=0; i<len; i++)

                b[i]=a[i];

                printf(“in the copied string is %s”,b);

                }

Write to reverse a string without library function strev.

#include<Stdio.h>

#include<conio.h>

Main()

{

                Int len  0, i;

                Char a[50] , t;

                Printf(“enter a string”);

                Gets(a);

                For (i=0; a[i] = ’\0’, i++)

Len =len +1;

For (i=0; i<=len-1-i];

{

T=a[i]

A[i]=a[len-1-i]

}

Printf(“in the reversedstring is %s”, a):

}