Input_Check

#include <stdio.h>
#include <stdlib.h>

int Input_Check(double Coeff[], int* size, int* begin){

    for(int i = *begin; i < 100; i++){
        int c;
        int check = scanf("%lg", &Coeff[i]);
        if((c = getchar()) == '\n'){
            *size = i + 1;
            return 0;
        }

        if(check == 0){
            printf("Please, try to input %d coefficient once more: ", i + 1);
            *begin = i - 1;
            return 1;
        }
    }


}

int main()
{
    double Coeff[100] = {0};
    int size = 0;
    int begin = 0;
    int prov = 7;
    while((prov = Input_Check(Coeff, &size, &begin)) != 0) Input_Check(Coeff, &size, &begin);
    for(int i = 0; i < size; i++) printf("%lg ", Coeff[i]);
    return 0;
}