A program that read a value n & display sec inverse(n) in C.

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

void main()
{
    float v,inverse;
    clrscr();
    printf("Enter any value = ");
    scanf("%f",&v);
    if(v<1)
       printf("Its Impossible; Please Enter number greater than 1.");
    else
    {
       inverse=acos(1.0/v)*180/M_PI;
       printf("\nSec Inverse(%.2f) = %.2f",v,inverse);
    }
    getch();
}


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Copy & paste this code in your TC & run, then you will get output.......
If you have any problem please comment below.........