Loop

---

for Loop

In C, a for loop is a control flow statement used to repeat a block of code a specific number of times. It is commonly used when the number of iterations is known beforehand. The syntax of a for loop in C

Project 1

#include <stdio.h>
void main()
{
    int i;
    for ( i = 1; i <= 20; i++)
    {
        printf("%d \t",i*5);
    }
}

Output :

5       10      15      20      25      30      35      40      45      50
55      60      65      70      75      80      85      90      95      100

---

while Loop

Project 2

#include <stdio.h>
int main()
{
    int i = 1;
    while (i <= 20)
    {
        printf("%d \t",i*5);
        i++;
    }
}

Output :

5       10      15      20      25      30      35      40      45      50
55      60      65      70      75      80      85      90      95      100

---

Project 3

#include <stdio.h>

int main()
{
    int i, amount;
    float number,avg,sum = 0;

    printf("Input N : ");
    scanf("%d", &amount);

    for (i = 1; i <= amount; i++)
    {
        printf("Enter number : ");
        scanf("%f", &number);   
        sum += number;
    }
    avg = sum / amount;
    printf("Sum : %.1f \t Avg : %.1f\n", sum, avg);
}

Output :

Input N : 3
Enter number : 10
Enter number : 20
Enter number : 30
Sum : 60.0       Avg : 20.0

---

Project 4

#include <stdio.h>

int main()
{
    int i, amount, price;
    float tax,sum;
    printf("Enter amount of goods : ");
    scanf("%d", &amount);
    for (i = 1; i <= amount; i++)
    {
        printf("Enter price %d : ", i);
        scanf("%d", &price);
        sum += price;
    }
    if (sum > 5000)
    {
        tax = sum * 0.07;
        printf("You must pay taxes : %.2f \n",tax);
        printf("You pay :%.2f\n",sum + tax);
    }else{
        printf("You don't have to pay taxes.\n");
        printf("You pay :%.2f\n",sum);
    }
}

Output :

Enter amount of goods : 4
Enter price 1 : 20
Enter price 2 : 100
Enter price 3 : 49
Enter price 4 : 59
You don't have to pay taxes.
You pay :228.00

---