// main test of the input from a file
void main(){
FILE *inFile;
FILE *outFile;
inFile = fopen("fileIO.in", "r");
outFile = fopen("fileIO.out", "w");
char input[256];
char output[256];
// can use fscanf, or fgets
//fscanf(inFile, "%[^\n]\n", input);
fgets(input, 256, inFile);
printf("Your file contains: %s", input);
fgets(output, 256, inFile);
fclose(inFile);
// change the output as desired
//output = input;
allcaps(output);
//int i;
//for(i = 0; i < 256; i++){
// output[i] = caseup(output[i]);
//}
// write out the final output
fprintf(outFile, "%s\n", output);
fclose(outFile);
}
// main run of program
void main(){
// initial variables for cipher
FILE *inFile;
FILE *outFile;
inFile = fopen("caesarCipher.in", "r");
outFile = fopen("caesarCipher.out", "w");
int inSize = 256;
char input[256] = "";
int outSize = 310;
char code[310] = "";
char mode;
int block = 5;
int key;
// set mode to cipher or decipher
printf("Please type a 'D' to decrypt or leave blank for encrypt: ");
scanf("%c", &mode);
// get the key from user for creating cipher
printf("Please enter the Caesar cipher key: ");
scanf("%d", &key);
if(mode == 'd' || mode == 'D')
key = 26 - key;
while(fgets(input, inSize, inFile) != NULL){
// modify code: letters only & all caps
parseinput(input, inSize, block, code);
allcaps(code, inSize);
// perform the Caesar cipher
int i;
for(i = 0; i < outSize; i++){
if(code[i] >= 'A' && code[i] <= 'Z')
code[i] = ((code[i] - 'A') + key) % 26 + 'A';
}
// write code to output
fprintf(outFile, "%s\n", code);
// reset strings for next iteration
memset(&input[0], 0, inSize);
memset(&code[0], 0, outSize);
}
// close files
fclose(inFile);
fclose(outFile);
// print out success
if(mode == 'd' || mode == 'D')
printf("Your input is decoded in 'caesarCipher.out utilizing key %d.\n", 26-key);
else
printf("Your input is encoded in 'caesarCipher.out'utilizing key %d.\n", key);
}
