init

1 files changed, 47 insertions, 0 deletions

diff --git a/caeser/caeser.cpp b/caeser/caeser.cpp
new file mode 100644
index 0000000..e2bd114
--- /dev/null
+++ b/caeser/caeser.cpp
@@ -0,0 +1,47 @@
+#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;
+}