for statement

for (start expression; test expression;  update expression)
{
	loop body
}


printf(“i       i * i\n”);
for (i = 0;   i < 5;  i++)
{
	iSquare = i * i;
	printf(“%d      %d\n”, i, iSquare);
}

output:
i       i * i
0 0
1 1
2 4
3 9
4 16

Note: i++ is same as i = i + 1

Table of celsius and fahrenheit temperatures:

0 degrees celsius, is 32 degrees fahrenheit
100 degrees celsius is 212 degrees fahrenheit

in general:  fahrenheit = 1.8 * celsius + 32

int main(void)
{
    int min, max, step;   /* range (min .. max and step) */
    int celsius;
    double fahrenheit;

    printf(“Enter min temp C: ”);  scanf(“%d”, min);
    printf(“Enter max temp C: ”);  scanf(“%d”, max);
    printf(“Enter step temp C: “);  scanf(“%d”, step);

    printf(“celsius     fahrenheit\n”);
    for (celsius = min;  celsius <= max;  celsius += step)
    {
           fahrenheit = 1.8 * celsius + 32;
           printf(“%3d           %6.1f\n”, celsius, fahrenheit);
    }
    return 0;
}



Note: celsius += step means celsius = celsius + step

Sample output (min = 10, max = 20 ,step = 5)
celsius       fahrenheit
 10                50.0
15 59.0
20                 68.0


other for statements:

   for (celsius = 30; celsius >= 0; celsius -= 3) { … }

    values of celsius:  30, 27, 24, 21, …

   for (oddNum = 1;  oddNum <= 50,  oddNum += 2) { … }

    values of oddNum:  1, 3, 5, 7, … 49

   for (celsius = 30; celsius <= 50; celsius -= 2) { … }

    loop body does not execute. Can’t ever reach 50 if value 
of celsius is decreased.