lecture-3.md

Lecture-3 Rules to Declare Variables and Formatting Output

Rules of Declare Variables

1. A Variable Name Can contain alphabates (A to Z)(a to z) , digits (0-9),underscore( _ ).

2. Cannot Start with digit.

3. Cannot use reserved keyword or special character.

4. Length of variable name should be less than 31 character.

Case Sensitivity

Text that is sensitive to capitalization of letters. For example, NAME ,name,NaMe are three different.

Example : Write a program to sum of 2 variable

#include <stdio.h>

int main() {
    int a=10;
    int b=20;
    int c;
    
    c=a+b;
    
    printf("%d",c);
    
    return 0;
}

⚙️ Output :

30

💻Example :

#include <stdio.h>

int main() {
    int val1=30;
    int val2=20;
    int sum;
    
    sum=val1 + val2;
    
    printf("%d",sum);
    
    return 0;
}

⚙️ Output :

50

💻Example :

#include <stdio.h>

int main() {
    int val1=30, val2=20, sum;
    
    sum=val1 + val2;
    
    printf("%d",sum);
    
    return 0;
}

⚙️ Output :

50

Formatting Output

💻Example :

#include <stdio.h>

int main() {
    int val1=30, val2=20, sum;
    
    sum=val1 + val2;
    
    printf(" sum = %d",sum);
    
    return 0;
}

⚙️ Output :

sum = 50

💻Example :

#include <stdio.h>

int main() {
    float num = 20.5;
    
    printf("Numberis %f", num);
    
    return 0;
}

⚙️ Output :

Numberis 20.500000

💻Example :

#include <stdio.h>

int main()
{
    float weight=80.5;
    
    printf("%f",weight);
    
    return 0;
}

⚙️ Output :

80.500000

💻Example :

#include <stdio.h>

int main() {
    int a = 10;
    int b = 20;
    int c = a + b;
    
    printf("a=%d b=%d",a,b);
    
    return 0;
}

⚙️ Output :

a=10 b=20

💻Example :

#include <stdio.h>

int main() {
    int val1 = 10;
    int val2 = 20;
    int sum = val1 + val2;
    
    printf("sum of %d and %d is %d",val1,val2,sum);
    
    return 0;
}

⚙️ Output :

sum of 10 and 20 is 30

🔗 Some Useful Links

📖 References