[C] this is ascii btw[C] this is ascii btw
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A Human Message
Week 4, 2026
#include
#include
#include
int main() {
char inString[1024];
scanf("%s", inString);
int len = strlen(inString);
int numNibbles = len / 4;
// Arrays to store the intermediate steps
char hexStore[numNibbles + 1];
// 1 & 2: Process binary into Hex characters
for (int i = 0; i < numNibbles; i++) {
// Look at a 4-bit chunk
char chunk[5];
strncpy(chunk, &inString[i * 4], 4);
chunk[4] = '\0';
// Convert the 4-bit string to a hex char
if (strcmp(chunk, "0000") == 0) hexStore[i] = '0';
else if (strcmp(chunk, "0001") == 0) hexStore[i] = '1';
else if (strcmp(chunk, "0010") == 0) hexStore[i] = '2';
else if (strcmp(chunk, "0011") == 0) hexStore[i] = '3';
else if (strcmp(chunk, "0100") == 0) hexStore[i] = '4';
else if (strcmp(chunk, "0101") == 0) hexStore[i] = '5';
else if (strcmp(chunk, "0110") == 0) hexStore[i] = '6';
else if (strcmp(chunk, "0111") == 0) hexStore[i] = '7';
else if (strcmp(chunk, "1000") == 0) hexStore[i] = '8';
else if (strcmp(chunk, "1001") == 0) hexStore[i] = '9';
else if (strcmp(chunk, "1010") == 0) hexStore[i] = 'A';
else if (strcmp(chunk, "1011") == 0) hexStore[i] = 'B';
else if (strcmp(chunk, "1100") == 0) hexStore[i] = 'C';
else if (strcmp(chunk, "1101") == 0) hexStore[i] = 'D';
else if (strcmp(chunk, "1110") == 0) hexStore[i] = 'E';
else if (strcmp(chunk, "1111") == 0) hexStore[i] = 'F';
}
hexStore[numNibbles] = '\0';
// 3: Convert Hex pairs to ASCII characters
for (int i = 0; i < numNibbles; i += 2) {
// Take two hex digits (8 bits total) and convert to a byte
char hexPair[3] = { hexStore[i], hexStore[i+1], '\0' };
// strtol converts the string base-16 to a long integer
int asciiVal = (int)strtol(hexPair, NULL, 16);
printf("%c", (char)asciiVal);
}
printf("\n");
return 0;
}
