C
Program to Calculate the Sum of Odd & Even Numbers
#include
#include
void main()
{
int i, num, odd_sum =
0, even_sum = 0;
clrscr();
printf("Enter the
value of num\n");
scanf("%d",
&num);
for (i = 1; i <=
num; i++)
{
if (i % 2 == 0)
even_sum =
even_sum + i;
else
odd_sum =
odd_sum + i;
}
printf("Sum of
all odd numbers = %d\n", odd_sum);
printf("Sum of
all even numbers = %d\n",
even_sum);
getch();
}
Output
Enter the value of num
10
Sum of all odd numbers = 25
Sum of all even numbers = 30
C Program to Reverse a Number & Check if it is a Palindrome
#include
#include
void main()
{
int num, temp, remainder, reverse = 0;
clrscr();
printf("Enter an integer \n");
scanf("%d", &num);
temp = num;
while (num > 0)
{
remainder = num % 10;
reverse = reverse * 10 + remainder;
num /= 10;
}
printf("Given number is = %d\n", temp);
printf("Its reverse is = %d\n", reverse);
if (temp == reverse)
printf("Number is a palindrome \n");
else
printf("Number is not a palindrome \n");
getch();
}
Output
Enter an integer
6789
Given number is = 6789
Its reverse is = 9876
Number is not a palindrome
C Program to Find the Number of Integers Divisible by 5
#include
#include
void main()
{
int i, num1, num2, count = 0, sum = 0;
clrscr();
printf("Enter the value of num1 and num2 \n");
scanf("%d %d", &num1, &num2);
printf("Integers divisible by 5 are \n");
for (i = num1; i < num2; i++)
{
if (i % 5 == 0)
{
printf("%3d,", i);
count++;
sum = sum + i;
}
}
printf("\n Number of integers divisible by 5 between %d and %d =
%d\n", num1, num2, count);
printf("Sum of all integers that are divisible by 5 = %d\n", sum);
getch();
}
Output
Enter the value of num1 and num2
12 17
Integers divisible by 5 are
15,
Number of integers divisible by 5 between 12 and 17 = 1
Sum of all integers that are divisible by 5 = 15
C Program to Read Two Integers M and N & Swap their Values
#include
#include
void swap(float *ptr1, float *ptr2);
void main()
{
float m, n;
clrscr();
printf("Enter the values of M and N \n");
scanf("%f %f", &m, &n);
printf("Before Swapping:M = %5.2ftN = %5.2f\n", m, n);
swap(&m, &n);
printf("After Swapping:M = %5.2ftN = %5.2f\n", m, n);
}
void swap(float *ptr1, float *ptr2)
{
float temp;
temp = *ptr1;
*ptr1 = *ptr2;
*ptr2 = temp;
}
Output
Enter the values of M and N
2 3
Before Swapping:M = 2.00 N = 3.00
After Swapping:M = 3.00 N = 2.00
C Program to convert the given Binary Number into Decimal
#include
#include
void main()
{
int num, binary_val, decimal_val = 0, base = 1, rem;
clrscr();
printf("Enter a binary number(1s and 0s) \n");
scanf("%d", &num);
binary_val = num;
while (num > 0)
{
rem = num % 10;
decimal_val = decimal_val + rem * base;
num = num / 10 ;
base = base * 2;
}
printf("The Binary number is = %d \n", binary_val);
printf("Its decimal equivalent is = %d \n", decimal_val);
getch();
}
Output
Enter a binary number(1s and 0s)
10101001
The Binary number is = 10101001
Its decimal equivalent is = 169S
C Program to Reverse a Given Number
#include
#include
void main()
{
long num, reverse = 0, temp, remainder;
clrscr();
printf("Enter the number\n");
scanf("%ld", &num);
temp = num;
while (num > 0)
{
remainder = num % 10;
reverse = reverse * 10 + remainder;
num /= 10;
}
printf("Given number = %ld\n", temp);
printf("Its reverse is = %ld\n", reverse);
getch();
}
Output
Enter the number
567865
Given number = 567865
Its reverse is = 568765
C Program to illustrate how User Authentication is done
#include
#include
void main()
{
char password[10], username[10], ch;
int i;
clrscr();
printf("Enter User name: ");
gets(username);
printf("Enter the password < any 8 characters>: ");
for (i = 0; i < 8; i++)
{
ch = getchar();
password[i] = ch;
ch = '*' ;
printf("%c", ch);
}
password[i] = '\0';
printf("\n Your password is :");
for (i = 0; i < 8; i++)
{
printf("%c", password[i]);
}
}
Output
Enter User name: rajaraman
Enter the password <any 8 characters>: shashi12
********
Your password is :shashi12
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