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CS113 -  Fall 1998

if-statement practice						

Here are 15 short programs which use if-else. 
There are no comments but you can easily tell what they do by reading
them. I've used a couple of these programs in class. 

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1.

#include <stdio.h>

int
main(void)
{
    int number1, number2;

    printf("Please enter two numbers: ");
    scanf("%d %d",&number1, &number2);

    if (number1 > number2)
        printf("%d is bigger\n", number1);
    else
        printf("%d is bigger\n", number2);

    return (0);
}



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2.

#include <stdio.h>

int
main(void)
{
    int number1, number2;

    printf("Please enter two numbers: ");
    scanf("%d %d",&number1, &number2);

    if (number1 == number2)
        printf("yes\n");
    else
        printf("no\n");

    return (0);
}


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3.

#include <stdio.h>

int
main(void)
{
    int number;

    printf("Please enter a number: ");
    scanf("%d",&number);

    if (number % 2 == 0)
        printf("%d is even\n", number);
    else
        printf("%d is odd\n", number);

    return (0);
}



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4.

#include <stdio.h>

int
main(void)
{
    int number;

    printf("Please enter a number: ");
    scanf("%d",&number);

    if (number % 3 == 0)
        printf("%d is divisible by 3\n", number);
    else
        printf("%d is not divisible by 3\n", number);

    return (0);
}


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5.

#include <stdio.h>

int
main(void)
{
    int number1, number2;

    printf("Please enter two numbers: ");
    scanf("%d %d",&number1, &number2);

    if (number1 < number2)
        printf("%d is smaller\n", number1);
    else
        printf("%d is smaller\n", number2);

    return (0);
}



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6.

#include <stdio.h>

int
main(void)
{
    int number;

    printf("Please enter a number: ");
    scanf("%d",&number);

    if (number == 0)
        printf("It is zero\n");
    else
        printf("It is not zero\n");

    return (0);
}


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7.

#include <stdio.h>

int
main(void)
{
    int number;

    printf("Please enter a number: ");
    scanf("%d",&number);

    if (number > 0)
        printf("%d is positive\n", number);
    else
        printf("%d is not positive\n", number);

    return (0);
}



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8.

#include <stdio.h>

int
main(void)
{
    int number1, number2;

    printf("Please enter two numbers: ");
    scanf("%d %d",&number1, &number2);

    if (number1 == -number2)
        printf("%d is the negative of %d\n",number1,number2);
    else
        printf("%d is not the negative of %d\n",number1,number2);

    return (0);
}


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9.

#include <stdio.h>

int
main(void)
{
    int number1, number2;

    printf("Please enter a number: ");
    scanf("%d",&number);

    if (number * number > 60)
        printf("%d squared is bigger than 60\n", number);
    else
        printf("%d squared is not bigger than 60\n", number);

    return (0);
}



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10.

#include <stdio.h>

int
main(void)
{
    int number1, number2;

    printf("Please enter two numbers: ");
    scanf("%d %d",&number1, &number2);

    if (number1 * number1 + number2 * number2 > 20)
        printf("The sum of their squares is greater than 20\n");
    else
        printf("The sum of their squares is not greater than 20\n");

    return (0);
}


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11.

#include <stdio.h>

int
main(void)
{
    int number1, number2;

    printf("Please enter two numbers: ");
    scanf("%d %d",&number1, &number2);

    if (number1 * number2 > 0)
        printf("Their product is positive\n");
    else
        printf("Their product is not positive\n");

    return (0);
}



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12.

#include <stdio.h>

int
main(void)
{
    int number1, number2;

    printf("Please enter two numbers: ");
    scanf("%d %d",&number1, &number2);

    if (number1 %  number2 == 0)
        printf("%d is divisible by %d\n", number1, number2);
    else
        printf("%d is not divisible by %d\n", number1, number2);

    return (0);
}


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13.

#include <stdio.h>

int
main(void)
{
    int number1, number2, number3;

    printf("Please enter three numbers: ");
    scanf("%d %d",&number1, &number2, &number3);

    if (number1 * number1 + number2 * number2 == number3 * number3)
        printf("The sum of the squares is equal\n");
    else
        printf("The sum of the squares is not equal\n");

    return (0);
}



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14.

#include <stdio.h>

int
main(void)
{
    int number1, number2;

    printf("Please enter two numbers: ");
    scanf("%d %d",&number1, &number2);

    if ((number1 == 0) && (number2 == 0))
        printf("They are both 0\n");
    else
        printf("They are not both 0\n");

    return (0);
}


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15.

#include <stdio.h>

int
main(void)
{
    int number1, number2;

    printf("Please enter two numbers: ");
    scanf("%d %d",&number1, &number2);

    if ((number1 == 0)|| (number2 == 0))
        printf("At least one is 0\n");
    else
        printf("Neither one is 0\n");

    return (0);
}



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