1. C Fundamental Program 1

Programs (Part 1 - Basics & Conditions)

1. Sum of Two Numbers

#include <stdio.h>
int main() {
    int num1, num2, sum;
    printf("Enter two numbers: ");
    scanf("%d %d", &num1, &num2);
    sum = num1 + num2;
    printf("Sum is: %d\n", sum);
    return 0;
}

2. Calculate Area of the Circle

#include <stdio.h>
int main() {
    float radius, area;
    printf("Enter the radius of the circle: ");
    scanf("%f", &radius);
    area = 3.14159 * radius * radius;
    printf("Area of the circle is: %.2f\n", area);
    return 0;
}

3. Print Details of the User

#include <stdio.h>
int main() {
    char name[50];
    int age;
    printf("Enter your name: ");
    gets(name); // Using gets() as requested, though fgets() is safer.
    printf("Enter your age: ");
    scanf("%d", &age);
    
    printf("\n--- User Details ---\n");
    printf("Name: %s\n", name);
    printf("Age: %d\n", age);
    return 0;
}

4. Positive, Negative, or Zero (Using Ternary Operator)

#include <stdio.h>
int main() {
    int n;
    printf("Enter a number: ");
    scanf("%d", &n);
    
    // Ternary Operator: condition ? true_exp : false_exp
    (n > 0) ? printf("Positive\n") : 
            ((n < 0) ? printf("Negative\n") : printf("Zero\n"));
    return 0;
}

5. Positive, Negative, or Zero (Without Ternary Operator)

#include <stdio.h>
int main() {
    int n;
    printf("Enter a number: ");
    scanf("%d", &n);
    
    if (n > 0) {
        printf("Positive\n");
    } else if (n < 0) {
        printf("Negative\n");
    } else {
        printf("Zero\n");
    }
    return 0;
}

6. Greatest Among Three Numbers (Using Ternary Operator)

#include <stdio.h>
int main() {
    int a, b, c, max;
    printf("Enter three numbers: ");
    scanf("%d %d %d", &a, &b, &c);
    
    max = (a > b) ? ((a > c) ? a : c) : ((b > c) ? b : c);
    
    printf("Greatest number is %d\n", max);
    return 0;
}

7. Greatest Among Three Numbers (Without Ternary Operator)

#include <stdio.h>
int main() {
    int a, b, c;
    printf("Enter three numbers: ");
    scanf("%d %d %d", &a, &b, &c);
    
    if (a >= b && a >= c) {
        printf("Greatest is %d\n", a);
    } else if (b >= a && b >= c) {
        printf("Greatest is %d\n", b);
    } else {
        printf("Greatest is %d\n", c);
    }
    return 0;
}

8. Checking Odd or Even (Using Ternary Operator)

#include <stdio.h>
int main() {
    int num;
    printf("Enter a number: ");
    scanf("%d", &num);
    
    (num % 2 == 0) ? printf("Even\n") : printf("Odd\n");
    return 0;
}

9. Checking Odd or Even (Without Ternary Operator)

#include <stdio.h>
int main() {
    int num;
    printf("Enter a number: ");
    scanf("%d", &num);
    
    if (num % 2 == 0) {
        printf("Even\n");
    } else {
        printf("Odd\n");
    }
    return 0;
}

10. Factor of a Given Number (Without Function)

#include <stdio.h>
int main() {
    int num, i;
    printf("Enter a positive integer: ");
    scanf("%d", &num);
    
    printf("Factors of %d are: ", num);
    for (i = 1; i <= num; i++) {
        if (num % i == 0) {
            printf("%d ", i);
        }
    }
    printf("\n");
    return 0;
}