gistfile1.txt

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int charpos(const char character, const char *char_set)
{
    int counter;
    int length = strlen(char_set);
    for (counter = 0; counter<length; counter++){
        if (char_set[counter] == character){
            printf("%s\n", "character found in char_set" );
            return counter;
        } 
    }
    printf("%s\n", "character not found in char_set");
    return -1;
}

char *interpret_set(const char *input_set)
{
    int counter;
    int length = strlen(input_set);
    char output[100];
    
    for(counter = 0; counter<length; counter++){
        printf("%c\n", input_set[counter]);
        if(input_set[counter] == '\134'){
            //printf("%s\n", "true");
            switch (input_set[counter+1]) {
                case 92:
                output[counter] = '\134';
                printf("%s\n", "Assigned a double escape.");
                break;
                
                case 110:
                output[counter] = '\012';
                printf("%s\n", "Assigned a new line.");
                break;
                
                case 114:
                output[counter] = '\015';
                printf("%s\n", "Assigned a carrage return.");
                break;
                
                case 116:
                output[counter] = '\011';
                printf("%s\n", "Assigned a tab.");
                break;
                
                default:
                printf("%s\n", "This escape sequence is not supported.");
                break;
            }
        } else {
            output[counter] = input_set[counter];
            //printf("%s\n", "false");
        }
    }
    return 0;
}

int main(int argc, char *argv[])
{
    if (argc > 3) {
        printf("You entered too many arguements, please submit mytr     in this format. \n Usage: mytr [-d] SET1 [SET2]");
    } else if(argc < 3) {
        printf("You entered too few arguements, please submit mytr in this format. \n Usage: mytr [-d] SET1 [SET2]");
    } else {
        interpret_set(argv[1]);
        charpos('r', argv[1]);
    }
    return -1;
}


Results:

Executing the program....
$demo test\thello\\rwill\\n test
t
false
e
false
s
false
t
false
t
false
h
false
e
false
l
false
l
false
o
false
\
true
Assigned a carrage return.
r
false
w
false
i
false
l
false
l
false
\
true
Assigned a new line.
n
false
character found in char_set