grep

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

//FILE *input;
//FILE *output;
int help()
{
	printf(" Grep.txt -i Input.txt -o Output.txt ");
	exit(1);
}
int notsymbols(char c, FILE *ab)
{
	int a=0;
	if (c == '\n' || c == '\t' || c == ' ' || feof(ab))
		{
					a++;
		}
	return a;
}
int main ( int argc, char**argv)
{
	FILE *input;
	FILE *output;
	input=NULL;
	output=NULL;
	char tab[2],tab2[2];
	int SymbolsInLine=0,line=0,TotalSymbols=0,NotSymbols=0,k=0,WordsInLine=0,TotalWords=0;
	if (argc == 2 && argv[1][1] == 'h')
        {

        }
        else if (argc != 5)
        {
                printf("Error\nFor helt type Grep.exe -h\n");
                exit (1);
        }
        for (int i = 1; i < argc;i++)
        {
                if (argv[i][0] == '-')
                {
                        switch (argv[i][1])
                        {
                        case 'h':
                                help();
                                break;
                        case 'i':
                                input = fopen(argv[i+1], "r");
                                break;
                        case 'o':
                                output = fopen(argv[i+1], "w");
                                break;

                        default:
                                printf("unknown command '%c'\n", argv[i][1]);
                                break;

                        }
                }
                else
                        continue;
        }
    if(output==NULL)
    {
        printf("Error with output file\n");
    }
	else
	{
		if (input == NULL)
		{
			printf("Error with input file\n");
		}
		else
		{
			while (!feof(input))
			{
				SymbolsInLine++;
				char c = fgetc(input);
				k = SymbolsInLine % 2;
				int pre = (k + 1) % 2;
				tab2[k] = c;

				if ((tab2[k] == ',' || tab2[k] == '-' || tab2[k] == '.') && tab2[pre] == ' ')
				{
					tab[k] = ' ';
				}
				else
				{
					tab[k] = c;
				}
				if ((tab[k] == ' ' || tab[k] == '\n' || tab[k] == '\t' || feof(input)) && SymbolsInLine != 1)
				{
					if (tab[pre] == ' ' || (tab[pre]>47 && tab[pre]<58))
					{
					}
					else
					{
						WordsInLine++;
					}
				}

				NotSymbols= NotSymbols + notsymbols(c,input);

				if (c == '\n' || feof(input))
				{
					line++;
					TotalSymbols = TotalSymbols + SymbolsInLine - NotSymbols;
					TotalWords = TotalWords + WordsInLine;
					// puting the result in output file
					fprintf(output, "number of symbols in line%2d=%3d\n", line, SymbolsInLine - NotSymbols);
					fprintf(output, "number of words   in line%2d=%3d\n", line, WordsInLine);

					SymbolsInLine = 0;
					NotSymbols = 0;
					WordsInLine = 0;
				}
				if (feof(input))
				{
					// putting the result in output file
					fprintf(output, "\nnumber of  all symbols=%3d \n", TotalSymbols);
					fprintf(output, "number of  all lines  =%3d \n", line);
					fprintf(output, "number of  all words  =%3d \n", TotalWords);
				}
			}
			fclose(input);
		}
		fclose(output);
	}
return 0;
}