How do I set the I2C (Mpu-6050) slave address in my application?

int file;
if ((file = open("/dev/i2c-1", O_RDWR)) < 0) {
    perror("Failed to open the i2c bus");
    return 1;
}

int addr = 0x68; // The I2C address of the MPU-6050
if (ioctl(file, I2C_SLAVE, addr) < 0) {
    perror("Failed to acquire bus access and/or talk to slave");
    return 1;
}