Take the following program and convert the switch/case structures to equivalent if() statements, without breaking functional operation of the original program. Some sample output follows (for verification purposes).

1

#include <stdio.h>                                                                        
#include <stdlib.h>
#include <string.h>
 
int main(int argc, char **argv)
{
    int i;
    char value = 0;
 
    switch(argc)
    {   
        case 1:
            fprintf(stderr, "Error! Please provide word to encode ");
            fprintf(stderr, "on command-line.\n\n");
            fprintf(stderr, "Syntax is:\n");
            fprintf(stderr, "===================================\n");
            fprintf(stderr, "a,e,i,o,u,w,h,y .......... no value\n");
            fprintf(stderr, "s,c,z .................... 0\n");
            fprintf(stderr, "t,d,th ................... 1\n");
            fprintf(stderr, "n ........................ 2\n");
            fprintf(stderr, "m ........................ 3\n");
            fprintf(stderr, "r ........................ 4\n");
            fprintf(stderr, "l ........................ 5\n");
            fprintf(stderr, "ch,sh,g,j,dg,tch ......... 6\n");
            fprintf(stderr, "k,q,x,C,G,-ng,-nk ........ 7\n");
            fprintf(stderr, "f,v,ph ................... 8\n");
            fprintf(stderr, "p,b ...................... 9\n");
            fprintf(stderr, "===================================\n\n");
            exit(1);
            break;
 
        case 2:
            break;
 
        default:
            fprintf(stderr, "Additional arguments will be ignored.\n");
            break;
    }   
 
    for (i = 0; i < strlen(*(argv+1)); i++)
    {   
        value = *(*(argv+1)+i);
        switch(value)
        {
            case 'a':
            case 'e':
            case 'i':
            case 'o':
            case 'u':
            case 'w':
            case 'h':
            case 'y':
                break;
 
            case 's':
            case 'c':
                if ((*(*(argv+1)+(i+1))) == 'h')
                    fprintf(stdout, "6");
                else
            case 'z':
                    fprintf(stdout, "0");
                break;
 
            case 'd':
                if ((*(*(argv+1)+(i+1))) == 'g')
                {
                    fprintf(stdout, "6");
                    i++;
                    break;
                }
                else
            case 't':
                if ((*(*(argv+1)+(i+1))) == 'c')
                {
                    if ((*(*(argv+1)+(i+2))) == 'h')
                    {
                        fprintf(stdout, "6");
                        i = i + 2;
                        break;
                    }
                }
                else
                    fprintf(stdout, "1");
                break;
 
            case 'n':
                if (((*(*(argv+1)+(i+1))) == 'g') || ((*(*(argv+1)+(i+1))) == 'k'))
                {
                    fprintf(stdout, "7");
                    i++;
                    break;
                }
                else
                    fprintf(stdout, "2");
                break;
 
            case 'm':
                fprintf(stdout, "3");
                break;
 
            case 'r':
                fprintf(stdout, "4");
                break;
 
            case 'l':
                fprintf(stdout, "5");
                break;
 
            case 'j':
            case 'g':
                fprintf(stdout, "6");
                break;
 
            case 'k':
            case 'q':
            case 'x':
            case 'C':
                if ((*(*(argv+1)+(i+1))) == 'k')
                    i++;
            case 'G':
                fprintf(stdout, "7");
 
                if (value == 'x')
                    fprintf(stdout, "0");
 
                break;
 
            case 'f':
            case 'v':
                fprintf(stdout, "8");
                break;
 
            case 'p':
                if ((*(*(argv+1)+(i+1))) == 'h')
                {
                    fprintf(stdout, "8");
                    i++;
                    break;
                }
            case 'b':
                fprintf(stdout, "9");
                break;
 
            default:
                fprintf(stdout, " ");
                break;
        }
    }
 
    fprintf(stdout, "\n");
 
    return(0);
}

$ ./major1 Computer
73914
$ ./major1 "platform for sandwiches"
951843 84 02160
$ ./major1 "the mountain ate the doG"
1 3212 1 1 17
$ ./major1 "the ocean is biG"
1 02 0 97
$