Variables are containers for storing data values, like numbers and characters. In C, there are different types of variables (defined with different keywords), for example:

Variables

• int - stores integers (whole numbers), without decimals, such as 123 or -123
• float - stores floating point numbers, with decimals, such as 19.99 or -19.99
• char - stores single characters, such as ‘a’ or ‘B’. Characters are surrounded by single quotes

Project 1

#include <stdio.h>
void main()
{
    char c1,c2;
    c1 = 'a';
    c2 = 'A';
    printf("\n c1 = %c and ASCII value c1 = %d",c1,c1);
    printf("\n c2 = %c and ASCII value c1 = %d",c2,c2);
}

Output :

c1 = a and ASCII value c1 = 97
c2 = A and ASCII value c1 = 65

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Project 2

#include <stdio.h>
void main()
{
    int banana = 5;
    int orange = 10;
    int total = banana + orange;

    printf("%d banana and %d orange\n",banana,orange);
    printf("I have %d fruits in total",total);
}

Output :

5 banana and 10 orange
I have 15 fruits in total

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Project 3

#include <stdio.h>
void main()
{
    float PI = 3.14;
    float r = 2.2;
    float result;
    result = 2 * PI * r;

    printf("cricmference is %f",result);
}

Output :

cricmference is 13.816001

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Project 4

#include <stdio.h>
void main()
{
    int length = 15;
    float width = 3.3;
    float total = length * width;

    printf("Square has an area of %f",total);
}

Output :

Square has an area of 49.500000

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