为什么我的程序将最后一个输入行打印两次？

Question

My program is supposed to print what my input give reading it letter by letter with a scanf and saving them in variables when after they print whats inside them. This in a cycle so it can print every line. But it seems it either is scanning the last line two times or printing it two times

I tried putting \\n inside the scans which solve the printing problem but now it wouldn't print the first letters of each line

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

int main()
{
    double tempG = 0;
    double altG = 0;
    double humG = 0;

    char cultivo[100] = " ";

    char  nombre[100] = " ";
    double temp = 0;
    double alt = 0;
    double hum = 0;

    char insertado;
    
    int contador = 0;
    scanf("%lf %lf %lf" , &tempG, &altG, & humG);
    printf("%2.0lf %2.0lf %2.0lf \n \n", tempG, altG, humG);
    char temporal[100] = "";
    while(scanf("%c", &insertado) != EOF){
            scanf("%s %lf %lf %lf", nombre, &temp, &alt, &hum);
            printf("%s %.0lf %.0lf %.0lf \n", nombre, temp, alt, hum);
    }
    
    return 0;
}

This is my input and my expected output:

 25 65 1200 Banano 27 50 1000 Brocoli 16 75 2500 Fresas 18 80 2000 Zanahoria 21 75 1200 Tomate 22 75 1000

This is my actual output:

 25 65 1200 Banano 27 50 1000 Brocoli 16 75 2500 Fresas 18 80 2000 Zanahoria 21 75 1200 Tomate 22 75 1000 Tomate 22 75 1000

Answer 1

• scanf is reading values into variables that aren't cleared before each run.
• You aren't checking the return value of scanf to make sure that it succeeded.
• scanf doesn't read the newline at the end of the input, but the scanf('%c') does.

Together this means after you read your last line of input, you loop back, while(scanf(…)) successfully reads in the final newline, your other scanf fails because there's no more input, and the printf prints the stale data inside the local variables.