C/C++ • What's wrong with raspberry, I'm not able to run a program with the bcm2835 library on Geany and QT. Compiles correctly

Code:

#include <stdio.h>#include <bcm2835.h>  int main(int argc, char **argv){    char buf[2];    if (!bcm2835_init())return 1;      bcm2835_i2c_begin();                //Start I2C operations.    bcm2835_i2c_setSlaveAddress(0x20);  //I2C address    bcm2835_i2c_set_baudrate(100000);    //1M baudrate    printf("Start....\n");    while(1)      {           printf("Loop INI\n");        //buf[0] = 0x00;    //LED ON                buf[0] = 0b11111110;    //LED ONbuf[1] = 0b11111110;        bcm2835_i2c_write(buf,2);        bcm2835_delay(500);        buf[0] = 0xFF;     //LED OFF        buf[1] = 0xFF;     //LED OFF        bcm2835_i2c_write(buf,2);        bcm2835_delay(500);                 printf("Loop EOF\n");    }        bcm2835_i2c_end();      bcm2835_close();  return 0;}