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#include <iostream>
#include <cstring>
int char_to_int(char *c) {
int value = 0;
int sign = 1;
if(*c == '-') {
sign = -1;
c++;
}
while(*c != '\0') {
value *= 10;
value += *c - '0';
c++;
}
return value * sign;
}
int main(int argc, char *argv[]) {
if(argc != 3) {
throw std::invalid_argument("Wrong number of parameters! Run like this: \"caeser x texthere\" where X is the desired shift amount");
}
int inputLength = strlen(argv[2]);
int shift = char_to_int(argv[1]);
while (shift < 0) {
shift += 26;
}
char *output = (char*) malloc(inputLength);
for(int i = 0; i < inputLength; i++) {
int cVal = argv[2][i];
int rStart;
if(cVal >= 'A' && cVal <= 'Z') {
rStart = 'A';
}
else if(cVal >= 'a' && cVal <= 'z'){
rStart = 'a';
}
else {
output[i] = cVal;
continue;
}
int rVal = cVal - rStart;
rVal = (rVal + shift) % 26;
output[i] = rVal + rStart;
}
std::cout << output << '\n';
free(output);
return 0;
}
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