Bachelor of Technology in Information Technology

Write a C program to find the roots of a quadratic equation.

ALGORITHM:

Step 1: Start.

Step 2: declare a, b, c, discriminant, root1, root2, realPart, imagPart. Step 3: print enter coefficients of a, b, c.
Step 4: read a, b, c.
Step 5: discriminant ← b*b-4*a*c. Step 6: if(discriminant > 0)
root1←(-b + sqrt(discriminant))/(2*a) root2←(-b - sqrt(discriminant))/(2*a)
print root1 and root2.
Step7: else if(discriminant == 0)
root1 ← root2 ← -b/(2*a) print root1 and root2.
Step 8: else
realPart← -b/(2*a)
imagPart←sqrt(-discriminant)/(2*a)
print real and imag part of root1 and root2.
Step 9: Stop.

Source Code

#include #include int main() {

double a, b, c, discriminant, root1, root2, realPart, imagPart; printf("Enter coefficients a, b and c: ");
scanf("%lf %lf %lf", &a, &b, &c); discriminant = b * b - 4 * a * c;
// condition for real and different roots if (discriminant > 0) {
root1 = (-b + sqrt(discriminant)) / (2 * a); root2 = (-b - sqrt(discriminant)) / (2 * a);
printf("root1 = %.2lf and root2 = %.2lf", root1, root2);

}
// condition for real and equal roots else if (discriminant == 0) {

root1 = root2 = -b / (2 * a); printf("root1 = root2 = %.2lf;", root1);
} // if roots are not real else {
realPart = -b / (2 * a);
imagPart = sqrt(-discriminant) / (2 * a);
printf("root1 = %.2lf+%.2lfi and root2 = %.2f-%.2fi", realPart, imagPart, realPart, imagPart);
}
return 0;
}

1. Calculator using switch-case

ALGORITHM:

Step 1: Start.

Step 2: declare a, b, result, option. Step 3: print enter values of a & b. Step 4: read a, b
Step 5: print Select an option
1.Addition. 2.Subtraction 3.Multiplication 4.Division.
Step 6: read option Step 7: switch to option
If option 1:result ←a+b
Print result Break
If option 2: result ←a-b
Print result Break
If option 3: result← a/b
Print result Break
If option 4: result ← a*b
Print result Break
Default case: print invalid option selected
Break