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Many important math functions in C are in the math.h library.

Below is an example usage of some of the functions.

Note: If the degrees were 0.0, then the slope would be undefined and a divide by zero error would be raised. This is ignored for now.

The mathematical formula


can be written as the following coding expression using the math library sqrt function.

The mathematical formula


can be written as the following coding expression using the math library pow function.

The following program shows how to use the math library sqrt and pow functions.

Here is the C code.
#include <stdio.h> #include <math.h> int main() { // declarations double number1,root2,square2; // input printf("Enter a number.\n"); scanf("%lf",&number1); printf("You entered %0.2lf\n",number1); // process root2 = sqrt(number1); square2 = pow(number1,2); // output printf("\n"); printf("The square root of %0.2lf is %0.2lf\n",number1,root2); printf("The square of %0.2lf is %0.2lf\n",number1,square2); return 0; }

Here are some examples of input and output for the above program code.

Here is an example input.
4.0
For the above example input, here is the expected output.
Enter a number. You entered 4.00 The square root of 4.00 is 2.00 The square of 4.00 is 16.00
Here is an example input.
6.4
For the above example input, here is the expected output.
Enter a number. You entered 6.40 The square root of 6.40 is 2.53 The square of 6.40 is 40.96
Here is an example input.
1.44
For the above example input, here is the expected output.
Enter a number. You entered 1.44 The square root of 1.44 is 1.20 The square of 1.44 is 2.07
Here is the output of the C code.

The math library provides many mathematical functions.

Here is the C code.
#include <stdio.h> #include <math.h> int main() { // declarations double degrees1,radius1; double length1,area1,volume1; double radians1,dx1,dy1,slope1; double tan1,radians2,degrees2; // input printf("Enter degrees and radius.\n"); scanf("%lf %lf",&degrees1,&radius1); printf("You entered degrees as %0.2lf and radius as %0.2lf.\n",degrees1,radius1); // process length1 = 2.0 * M_PI * radius1; area1 = M_PI*pow(radius1,2); volume1 = 4.0/3.0*M_PI*pow(radius1,3); radians1 = M_PI * degrees1 / 180.0; dx1 = radius1*cos(radians1); dy1 = radius1*sin(radians1); slope1 = dy1 / dx1; tan1 = tan(radians1); radians2 = atan(slope1); degrees2 = 180.0 * radians2 / M_PI; // output printf("\n"); printf("The circumference is %0.2lf units.\n",length1); printf("The area is %0.2lf units squared.\n",area1); printf("The volume is %0.2lf units cubed.\n",volume1); printf("\n"); printf("The angle is %0.2lf in degrees.\n",degrees1); printf("The angle is %0.2lf in radians.\n",radians1); printf("The horizontal projection is %0.2lf units.\n",dx1); printf("The vertical projection is %0.2lf units.\n",dy1); printf("The slope is %0.2lf.\n",slope1); printf("The tangent is %0.2lf.\n",tan1); printf("The inverse tangent is %0.2lf radians.\n",radians2); printf("The inverse tangent is %0.2lf degrees.\n",degrees2); return 0; }

Here are some examples of input and output for the above program code.

Here is an example input.
30.0 3.0
For the above example input, here is the expected output.
Enter degrees and radius. You entered degrees as 30.00 and radius as 3.00. The circumference is 18.85 units. The area is 28.27 units squared. The volume is 113.10 units cubed. The angle is 30.00 in degrees. The angle is 0.52 in radians. The horizontal projection is 2.60 units. The vertical projection is 1.50 units. The slope is 0.58. The tangent is 0.58. The inverse tangent is 0.52 radians. The inverse tangent is 30.00 degrees.
Here is an example input.
45.0 5.0
For the above example input, here is the expected output.
Enter degrees and radius. You entered degrees as 45.00 and radius as 5.00. The circumference is 31.42 units. The area is 78.54 units squared. The volume is 523.60 units cubed. The angle is 45.00 in degrees. The angle is 0.79 in radians. The horizontal projection is 3.54 units. The vertical projection is 3.54 units. The slope is 1.00. The tangent is 1.00. The inverse tangent is 0.79 radians. The inverse tangent is 45.00 degrees.

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