Given a text string, we want to convert to their Hexadecimal representations. The following C program when compiled and run, takes the command line parameters, convert to ASCII code and then print the Hex string to console.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 | #include <stdio.h> #include <string.h> void hex(unsigned char a, char* buf) { // hex lookup table char data[] = "0123456789ABCDEF"; buf[0] = '0'; buf[1] = 'x'; int i = 2; while (a) { buf[i ++] = data[a % 16]; a /= 16; } int j = 2; -- i; // reverse i..j while (j < i) { char t = buf[j]; buf[j] = buf[i]; buf[i] = t; i --; j ++; } } int main(int argc, char* argv[]) { if (argc == 0) { return 0; } for (int i = 1; i < argc; ++ i) { for (int j = 0; j < strlen(argv[i]); ++ j) { char buf[4]; unsigned char cur = argv[i][j] & 0xFF; hex(cur, buf); printf("\"%s\", ", buf); } } printf("\n"); return 0; } |
#include <stdio.h>
#include <string.h>
void hex(unsigned char a, char* buf) {
// hex lookup table
char data[] = "0123456789ABCDEF";
buf[0] = '0';
buf[1] = 'x';
int i = 2;
while (a) {
buf[i ++] = data[a % 16];
a /= 16;
}
int j = 2;
-- i;
// reverse i..j
while (j < i) {
char t = buf[j];
buf[j] = buf[i];
buf[i] = t;
i --;
j ++;
}
}
int main(int argc, char* argv[]) {
if (argc == 0) {
return 0;
}
for (int i = 1; i < argc; ++ i) {
for (int j = 0; j < strlen(argv[i]); ++ j) {
char buf[4];
unsigned char cur = argv[i][j] & 0xFF;
hex(cur, buf);
printf("\"%s\", ", buf);
}
}
printf("\n");
return 0;
}Compile using gcc hex.c -o hex
1 2 | # ./hex Hello "0x48", "0x65", "0x6C", "0x6C", "0x6F", |
# ./hex Hello "0x48", "0x65", "0x6C", "0x6C", "0x6F",
Online tool to convert String-Text to ASCII.
–EOF (The Ultimate Computing & Technology Blog) —
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