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# Program to compute area under a curve

Posted By: Finley Evans     Category: C Programming     Views: 31405

## Code for Program to compute area under a curve in C Programming

```#include <stdio.h>
float    start_point,            /* GLOBAL VARIABLES */
end_point,
total_area;
int    numtraps;
main( )
{
void    input(void);
float    find_area(float a,float b,int n); /* prototype */

print(“AREA UNDER A CURVE”);
input( );
total_area = find_area(start_point, end_point, numtraps);
printf(“TOTAL AREA = %f”, total_area);
}
void input(void)
{
printf(“\n Enter lower limit:”);
scanf(“%f”, &start_point);
printf(“Enter upper limit:”);
scanf(“%f”, &end_point);
printf(“Enter number of trapezoids:”);
scanf(“%d”, &numtraps);
}
float find_area(float a, float b, int n)
{
floatbase, lower, h1, h2;    /* LOCAL VARIABLES */float function_x(float x);    /* prototype */float trap_area(float h1,float h2,floatbase);/*prototype*/base = (b-1)/n;
lower = a;
for(lower =a; lower <= b-base; lower = lower + base)
{
h1  =  function_x(lower);
h1  =  function_x(lower + base);
total_area += trap_area(h1, h2, base);
}
return(total_area);
float trap_area(float height_1,float height_2,floatbase)
{
float area;    /* LOCAL VARIABLE */
area = 0.5 * (height_1 + height_2) * base;
return(area);
}
float function_x(float x)
{
/* F(X) = X * X + 1 */return(x*x + 1);
}

Output

AREA UNDER A CURVE
Enter lower limit: 0
Enter upper limit:  3
Enter number of trapezoids: 30
TOTAL AREA   =  12.005000

AREA UNDER A CURVE
Enter lower limit: 0
Enter upper limit: 3
Enter number of trapezoids: 100
TOTAL AREA = 12.000438
```
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 Finley Evans author of Program to compute area under a curve is from London, United Kingdom. View All Articles