Fixed Point

#include<stdio.h>
#include<math.h>
float func(float x ){

    return pow(2.71828, -x);
}
int main(){


     printf("F(x)= e^-x -x  \n\n");
    int iteration, i;
    float xi = 0, ea = 0, root = 0.56714329, et = 0;
    printf("Enter Maximum Iteration Number: ");
    scanf("%d",&iteration);
    printf("\n\nSolution:-\n----------\n");
    printf("\nIteration \tXi \t\t%ca(%c) \t\t%ct(%c)", 228,37,228,37);
    printf("\n---------------------------------------------------------");
    for( i = 0; i <= iteration; i++ ){
        et = fabs( ( (root - xi)/root ) * 100  );
        printf("\n%d \t\t%f \t%f \t%f", i, xi, ea, et);
        ea = fabs( ( (func(xi) - xi)/func(xi) ) * 100  );
        xi = func(xi);
        printf("\n---------------------------------------------------------");
    }

    return 0;
}