chundoong-lab-ta/SHPC2023/hw1/convert.c

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2023-06-17 01:55:02 +09:00
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
void fallback_print_usage() {
printf("Usage: ./convert [int|long|float|double] number\n");
printf("Example: ./convert float 3.14\n");
exit(0);
}
void print_int(int x) {
// one character per one bit
char output[32 + 1] = {
0,
};
/* YOUR CODE START HERE */
for (int i = 0; i < 32; i++) {
if (((x >> i) & 1) == 1)
output[31 - i] = '1';
else
output[31 - i] = '0';
}
/* YOUR CODE END HERE */
printf("%s\n", output);
}
void print_long(long x) {
// one character per one bit
char output[64 + 1] = {
0,
};
/* YOUR CODE START HERE */
for (int i = 0; i < 64; i++) {
if (((x >> i) & 1) == 1)
output[63 - i] = '1';
else
output[63 - i] = '0';
}
/* YOUR CODE END HERE */
printf("%s\n", output);
}
void print_float(float x) {
// one character per one bit
char output[32 + 1] = {
0,
};
/* YOUR CODE START HERE */
union unions {
float f;
unsigned int ui;
};
union unions u;
u.f = x;
unsigned int y = u.ui;
for (int i = 0; i < 32; i++) {
if (((y >> i) & 1) == 1) {
output[31 - i] = '1';
} else
output[31 - i] = '0';
}
/* YOUR CODE END HERE */
printf("%s\n", output);
}
void print_double(double x) {
// one character per one bit
char output[64 + 1] = {
0,
};
/* YOUR CODE START HERE */
union unions {
double f;
unsigned long ui;
};
union unions u;
u.f = x;
unsigned long y = u.ui;
for (int i = 0; i < 64; i++) {
if (((y >> i) & 1) == 1) {
output[63 - i] = '1';
} else
output[63 - i] = '0';
}
/* YOUR CODE END HERE */
printf("%s\n", output);
}
int main(int argc, char **argv) {
if (argc != 3)
fallback_print_usage();
if (strcmp(argv[1], "int") == 0) {
print_int(atoi(argv[2]));
} else if (strcmp(argv[1], "long") == 0) {
print_long(atol(argv[2]));
} else if (strcmp(argv[1], "float") == 0) {
print_float(atof(argv[2]));
} else if (strcmp(argv[1], "double") == 0) {
print_double(atof(argv[2]));
} else {
fallback_print_usage();
}
}