#include <stdio.h>
#include <string.h>
// 7H15 M3554G3 is written in leet speak, where numbers resemble letters.
// place each leetspeak character with its matching letter
// (7 -> T, 1 -> I, 5 -> S, 3 -> E) and build a new string
// 7H15 -> THIS | M3554G3 -> MESSAGE
// Your brain can interpret distorted or number‑substituted letters
// surprisingly well because it recognizes the overall word
// shapes and patterns, not just individual characters.
// ------------------------------------------------------------
// Convert a single leet character into a normal alphabet letter
// ------------------------------------------------------------
char decodeChar(char c) {
switch (c) {
case '7': return 'T';
case '1': return 'I';
case '5': return 'S';
case '3': return 'E';
case '4': return 'A';
case '0': return 'O';
default: return c; // keep letters like H, M, G, etc.
}
}
// ------------------------------------------------------------
// Convert an entire string from leet speak to normal text
// ------------------------------------------------------------
void decodeLeet(const char *in, char *out) {
while (*in) {
*out = decodeChar(*in);
in++;
out++;
}
*out = '\0';
}
int main() {
// Test lines provided by the user
const char *lines[] = {
"7H15 M3554G3",
"53RV35 7O PR0V3",
"H0W 0UR M1ND5 C4N",
"D0 4M4Z1NG 7H1NG5!",
"1MPR3551V3 7H1NG5!",
"1N 7H3 B3G1NN1NG",
"17 WA5 H4RD BU7",
"N0W, Y0UR M1ND 1S",
"R34D1NG 17",
"4U70M471C4LLY."
};
char decoded[256] = "";
int count = sizeof(lines) / sizeof(lines[0]);
for (int i = 0; i < count; i++) {
decodeLeet(lines[i], decoded);
printf("%s\n", decoded);
}
return 0;
}
/*
run:
THIS MESSAGE
SERVES TO PROVE
HOW OUR MINDS CAN
DO AMAZING THINGS!
IMPRESSIVE THINGS!
IN THE BEGINNING
IT WAS HARD BUT
NOW, YOUR MIND IS
READING IT
AUTOMATICALLY.
*/
