quad.c

#include <stdio.h>
#include <math.h>

void main()
{
    float a, b, c, D;
    printf("ax^2+bx+c=0.\n");
    printf("Enter the values of a, b and c.\n");
    scanf("%f %f %f", &a, &b, &c);
    // printf("%fx^2+%fx+%f=0", a, b, c);
    
    D = pow(b,2)-4*a*c;
    
    if(D==0){
        printf("The quadratic equation has real and equal roots.\n");
        printf("Both the roots are %f.", -b/(2*(float)a));
    }else if(D>0){
        printf("The quadratic equation has real and distinct roots.\n");
        printf("The roots are %f and %f.", (-b+sqrt(D))/(2*a),(-b-sqrt(D))/(2*a) );
        
    }else{
        printf("The quadratic equation has imaginary roots.");
    }

    
}


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/******************************************************************************

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#include <stdio.h>
#include <math.h>

int fact(int n){
    int product = 1;
    
    
    while(n){
        product *= n;
        
        n--;
    }
    
    
    return product;
}

void main()
{
    int n, i = 0;
    float sum = 0;
    printf("Enter the number of terms: ");
    scanf("%d", &n);
    
    for(i = 1; i <=n; i++){
        sum += pow(i,i)/fact(i);
        
    }
    
    printf("The sum of the series upto %d terms is %f.", n, sum);

    
}
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#include <stdio.h>

int main()
{
    int i, n, arr[50], temp,a , b;
    printf("Enter the number of elements: ");
    scanf("%d", &n);
    
    for(i=0; i<n;i++){
        scanf("%d", &arr[i]);
    }
    
    a = 0;
    b = 0;
    for(i=0; i<n;i++){
        if(arr[i]>arr[a]){
            a=i;
        }
        if(arr[i]<arr[b]){
            b=i;
        }
    }
    
    temp = arr[a];
    arr[a] = arr[b];
    arr[b] = temp;
    
    
    printf("Array after swapping:\n");
    for(i=0; i<n;i++){
        printf("%d ", arr[i]);
    }
    
}
/******************************************************************************

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#include <stdio.h>

int main()
{
    int arr[5][3], max;
    
    for(int i = 0; i < 5; i++){
        printf("Enter the marks for the student #%d:\n", i+1);
        
        for(int j=0; j<3;j++){
                    printf("Enter the marks in subject#%d: ", j+1);
                    scanf("%d", &arr[i][j]);

        }
    }
    
    
    
    
        for(int j = 0; j < 3; j++){
        max = arr[0][j];
        for(int i = 0; i < 5; i++){
                    if(arr[i][j]> max){
                        max = arr[i][j];
                    }
        }
                printf("\nHighest marks in subject #1: %d.",max);

    }
    
    
    
}