BeforeChaos

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

int main()
{

    // 1c.______________________________________

    float pi = 3.1415926;
    char* s = "kerulete";
    double m = 6.23768e+24;

    printf("%.2f %12s %.3e", pi, s, m);

    printf("\n");

    // 2c.______________________________________

    int u1;
    double v1,v2;

    FILE* input;
    input = fopen("in.txt","r");

    if(input == NULL){
        perror(input);
    }

    fscanf(input,"%d %lf %lf", &u1, &v1, &v2 );

    fclose(input);

    printf("%d %lf %lf\n", u1, v1, v2);

    // 3c.______________________________________

    int error = 666;

    fprintf(stderr,"A hibakod: %8X\n", error);

    // 4c.______________________________________

    double kiA[6] = {1.1,1.2,1.3,1.4,1.5,1.6};
    double beA[6];

    FILE* inputB;
    inputB = fopen("a.bin","wb");

    if(inputB == NULL){
        perror(inputB);
    }

    fwrite(kiA, 6*sizeof(double), 1, inputB);

    fflush(inputB);

    inputB = fopen("a.bin","rb");

    fread(beA, 6*sizeof(double), 1, inputB);

    fclose(inputB);

    int i;

    for(i = 0; i < (int) (sizeof(beA) / sizeof(*beA)); i++){
        printf("%.1lf ", beA[i]);
    }
    // i < 6 is boven eleg persze, csak igy "ujrafelhasznalhatobb"
    return 0;
}