我怎样才能摆脱零，如果输入小数，它会打印小数，但如果输入整数，它会打印.00？

Question

This program prints overlapping of two intervals. But the problem is, if I enter, for example numbers: 1.1 -1.1 1.1 1.1, it prints out the whole number. I've tried writing %1.1f in last printf command, but it turned out to be even worse, because then, if I enter 1 2 1 1, it prints out 1.0 and 4.0. How can I get the proper print if I enter decimale or int?

#include <math.h>

int main() {
    float a,b,c,x,derivative;
    printf("Input coefficients a, b i c: ");
    scanf("%f %f %f",&a,&b,&c);
    if((a<(-10)) || (a>10) || (b<(-10)) || (b>10) || (c<(-10)) || (c>10)){
        printf("Coefficients a, b i c do not belong in range of (-10,10).");
        return 1;
    }
    printf("Input point x: ");
    scanf("%f",&x);
    derivative=(2*a*x)+b+(c*0);
    printf("First derivation in point x=%.f je %.f.",x,derivative);
    return 0;
}

Answer 1

You can use the "%g" format specifier to display floating-point numbers in the shortest possible way:

printf("First derivation in point x=%g je %g",x,derivative);