int main (int argc, char *argv[])
{
/* ifp: input file pointer*/
FILE *ifp;
/* ofp: output file pointer*/
FILE *ofp;
/*number: an integer number to be translated*/
int number;
/*output: will hold a pointer of the translated string output*/
char *output;
/*the number of command line argument received*/
int num_of_arguments = argc-1;
/*this switch case will start the relevant sub program based on the number of argument we received*/
switch (num_of_arguments) {
/*2 arguments: the first one will be an input file
the second one will be the output file*/
case 2 :
/*if we were not able to open the input file in read mode*/
if ((ifp=fopen(argv[1], "r")) == NULL)
fprintf(stderr ,"Cannot Open file %s\n", argv[1]);
/*if we were not able to open the output file in write mode*/
else if ((ofp=fopen(argv[2], "w"))== NULL)
fprintf(stderr, "Cannot Open file %s\n", argv[2]);
/*we succeeded to open both files*/
else
{
/*scan numbers from input file to number until reaching EOF*/
while (fscanf(ifp, "%d", &number) != EOF)
{
/*assign the output of translate_number to output*/
output = translate_number (number);
/*print the output which contains the translated number to the output file*/
fprintf(ofp, "%s\n", output);
}
}
/*after we done, close both files*/
fclose(ifp);
fclose(ofp);
break;
/*we received only one file, this will be the input file, the output will
be redirected to the standard output*/
case 1 :
/*Similar to "case 2", instead writing the output to an output file
we printing it to the standard output*/
if ((ifp=fopen(argv[1], "r")) == NULL)
fprintf(stderr, "Cannot Open file %s\n", argv[1]);
else
{
/*scan numbers from input file to number until reaching EOF*/
while (fscanf(ifp, "%d", &number) != EOF)
{
/*assign the output of translate_number to output*/
output = translate_number (number);
/*print the output to the standard output*/
printf("%s\n", output);
}
}
/*close file*/
fclose(ifp);
break;
/*we didn't received output and input files, the input number will be taken
directly from the standard input and the output will be redirected to the
standard output*/
case 0 : printf("\nUsage: Hitting Enter will show the result and wait for another input.\n\tCtrl-D will terminate the program.\n\tEntering Characters is not supported!\n\nEnter numbers to be translated:\n");
/*scan numbers into c while no End-Of-File received*/
while (scanf("%d", &number) != EOF)
{
/*if translate return a 0 value, this means that the entered number is >= 100 and number is < 0*/
if (*translate_number(number) == '0')
/*redirect the error message to the system's standard error*/
fprintf(stderr, "Not Supported Number\n" );
else
/*translate didn't retrun '0', then print the string*/
printf("%s\n", translate_number(number));
}
break;
/*we received more that 2 arguments, print the usage*/
default : fprintf(stderr, "Not Supported\nUsage: ./numbers <input file> <output file>\nOr\t./numbers <input file>\nOr\t./numbers\n");
break;
}
return OK;
}
int main (int argc, char *argv[])
{
/* ifp: input file pointer*/
FILE *ifp;
/* ofp: output file pointer*/
FILE *ofp;
/*number: an integer number to be translated*/
int number;
/*output: will hold a pointer of the translated string output*/
char *output;
/*c: a character to be entered - meant to recieve EOF*/
char c;
/*line: i a line in the input file (ifp)*/
char line[MAX_LINE];
/*the number of command line argument recieved*/
int num_of_arguments = argc-1;
/*this switch case will start the relevant sub program based on the number of argument we recienved*/
switch (num_of_arguments) {
/*2 arguments: the first one will be an input file
the second one will be the output file*/
case 2 :
/*if we were not able to open the input file in read mode*/
if ((ifp=fopen(argv[1], "r")) == NULL)
fprintf(stderr ,"Cannot Open file %s\n", argv[1]);
/*if we were not able to open the output file in write mode*/
else if ((ofp=fopen(argv[2], "w"))== NULL)
fprintf(stderr, "Cannot Open file %s\n", argv[2]);
/*we succeded to open both files*/
else
{
/*while the input file still has line*/
while (fgets(line, MAX_LINE, ifp)!= NULL)
{
/*replance the enter \n with \0 as string termination*/
*(strchr(line, '\n'))='\0';
/*convert the line to integer and assigne to number*/
number = atoi (line);
/*translate the number to a string and assigne to output*/
output = translate_number (atoi(line));
/*write output to the ouptu file*/
fprintf(ofp, "%s\n", output);
}
}
/*after we done, close both files*/
fclose(ifp);
fclose(ofp);
break;
/*we recieved only one file, this will be the input file, the output will
be redirected to the standart output*/
case 1 :
/*Similiar to "case 2", instead writing the output to an output file
we printing it to the standart output*/
if ((ifp=fopen(argv[1], "r")) == NULL)
fprintf(stderr, "Cannot Open file %s\n", argv[1]);
else
{
while (fgets(line, MAX_LINE, ifp)!= NULL)
{
*(strchr(line, '\n'))='\0';
number = atoi (line);
output = translate_number (atoi(line));
printf("%s\n", output);
}
}
fclose(ifp);
break;
/*we didnt recieve output and input files, the input number will be taken
directly from the standart input and the output will be redirected to the
standart output*/
case 0 : printf("Enter a number to be translated:\n");
do
{
/*scan the number with scanf and assign the value to number variable*/
scanf ("%i", &number);
/*if translate return a 0 value, this means that the entered number is >= 100 and number is < 0*/
if (*translate_number(number) == '0')
/*redirect the error message to the system's standart error*/
fprintf(stderr, "Not Supported Number\n" );
else
/*translate didn't retrun '0', then print the string*/
printf("%s\n", translate_number(number));
/*loop while we didn't recieve EOF*/
} while ((c = getchar()) != EOF);
break;
/*we rcieved more that 2 arguments, print the usage*/
default : fprintf(stderr, "Not Supported\nUsage: ./numbers <input file> <output file>\nOr\t./numbers <input file>\nOr\t./numbers\n");
break;
}
return OK;
}
