## C “Hello World!” Program

Code:

```#include<stdio.h>
int main()
{
printf("Hello World!");
return 0;
}```

Output:

`Hello World!`

## C Program to Print an Integer (Entered by the User)

Code:

```#include <stdio.h>
int main()
{
int integer;
printf("Enter a number: ");
scanf("%d", &integer);
printf("Your entered integer number is %d.",integer);
return 0;
}```

Output:

```Enter a number: 10
Your entered integer number is 10.```

## C Program to Add Two Integers

Code:

```#include <stdio.h>
int main()
{
int a = 10;
int b = 20;
int c ;
c = a + b;
printf("Sum of a and b is %d\n", c );
return 0;
}```

Output:

`Sum of a and b is 30`

## C Program to Multiply Two Floating-Point Numbers

Code:

```#include <stdio.h>
int main()
{
float a = 10.5, b = 1.5;
float c ;
c = a * b;
printf("Product of a and b is %.2f\n", c);
return 0;
}```

Output:

`Product of a and b is 15.75`

## C Program to Find ASCII Value of a Character

Code:

```#include<stdio.h>
int main()
{
char i;
for ( i = 65; i <= 122; i=i+1)
{
if(i>90 && i<97)
continue;
printf(", %c -%4d",i,i);
}
printf(",\n");
return 0;
}```

Output:

`, A -  65, B -  66, C -  67, D -  68, E -  69, F -  70, G -  71, H -  72, I -  73, J -  74, K -  75, L -  76, M -  77, N -  78, O -  79, P -  80, Q -  81, R -  82, S -  83, T -  84, U -  85, V -  86, W -  87, X -  88, Y -  89, Z -  90, a -  97, b -  98, c -  99, d - 100, e - 101, f - 102, g - 103, h - 104, i - 105, j - 106, k - 107, l - 108, m - 109, n - 110, o - 111, p - 112, q - 113, r - 114, s - 115, t - 116, u - 117, v - 118, w - 119, x - 120, y - 121, z - 122,`

## C Program to Compute Quotient and Remainder

Code:

```#include <stdio.h>
int main()
{
int Div, Divr, Quot, Rem;
printf("Enter first value: ");
scanf("%d", &Div);
printf("Enter second value: ");
scanf("%d", &Divr);
Quot = Div / Divr;
Rem = Div % Divr;
printf("Quotient is %d\n", Quot);
printf("Remainder %d", Rem);
return 0;
}```

Output:

```Enter first value: 60
Enter second value: 12
Quotient is 5
Remainder 0```

## C Program to Find the Size of int, float, double and char

Code:

```#include<stdio.h>
int main() {
int a;
float b;
double c;
char d;
printf("Type      Size\n");
printf("int     %ld bytes\n", sizeof(a));
printf("float   %ld bytes\n", sizeof(b));
printf("double  %ld bytes\n", sizeof(c));
printf("char    %ld byte\n", sizeof(d));
return 0;
}```

Output:

```Type      Size
int     4 bytes
float   4 bytes
double  8 bytes
char    1 byte```

## C Program to Swap Two Numbers

Code:

```#include<stdio.h>
int a,b,temp;
int main()
{
printf("Enter the value of a: ");
scanf("%d",&a);
printf("Enter the value for b: ");
scanf("%d",&b);
printf("Value of a is %d and b is %d before swapping.\n",a,b);
temp=a;
a=b;;
b=temp;
printf("Value of a is %d and b is %d after swapping.\n",a,b);
return 0;
}```

Output:

```Enter the value of a: 5
Enter the value for b: 3
Value of a is 5 and b is 3 before swapping.
Value of a is 3 and b is 5 after swapping.```