5. Необдуманный код
int main(void) {
size_t size = 10;
float *matrix = malloc(size * size * sizeof(float));
FILE* input_file = fopen("input1", "r");
int i = 0;
if ((fscanf(input_file, "%f", &matrix[i]) != 1) || sizeof(matrix[i]) != sizeof(float))
{
// error handling
}
}