Im using putty for a class assignment and I am getting a segmentation fault - putty

Question

Write a C program that counts the number of non white-space characters in an input text file. Program takes as command argument(s) the name of the input file (and the output file with option -f). Based on the option flags, it displays the output on the standard output, or writes the output to an output file. (25 points)
The command format is as follows:
command -f inputfile outputfile
or,
command -s inputfile
-f indicates writing to an output file;
-s indicates displaying the output on the screen.
I am receiving the segmentation fault on the -s command
#include <stdio.h>
#define BLANK ' '
#define NEWLINE '\n'
int main(int argc, char *argv[])
{
FILE *infile;
char c;
int char_count=0;
FILE *outfile;
outfile = fopen(argv[3], "w");
//checks for the argc length to be within the correct perameteres
if ((argc < 3) || (argc > 4))
{
printf("Incorrect format, please try gain\n");
exit(1);
}
//checks the input file to see if it is empty
if ( (infile= fopen(argv[2], "r")) == NULL)
{
fprintf(stderr,"%s: cannot open %s \n", argv[0], argv[1]);
exit(1);
}
// count the number of charecters in infile
while ( (c = getc(infile)) != EOF)
if ((c != BLANK) && (c != NEWLINE) )
char_count++;
//checks to see if the command is -s or not, outputing the corrct message to the desired location
if (argv[1] == "-s")
{
printf("%d characters\n", char_count);
}
else
{
fprintf(outfile, "%s contains %d characters\n", argv[2], char_count);
}
return 0;
}

Answer 1

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#define BLANK ' '
#define NEWLINE '\n'
int main(int argc, char *argv[])
{
FILE *infile;
FILE *outfile;
char c;
int char_count=0;
//checks for the argc length to be within the correct perameteres
if ((argc < 3) || (argc > 4))
{
printf("Incorrect format, please try gain\n");
exit(1);
}
//checks if passed second argument is valid (-f or -s)
if (strcmp(argv[1], "-f") == 0) {
if (argc < 4) {
fprintf(stderr, "Please inform output file. Usage: -f inputfile outputfile");
exit(1);
}
outfile = fopen(argv[3], "w");
}
else if (strcmp(argv[1], "-s") != 0) {
fprintf(stderr, "Parameter not recognized: %s\n", argv[1]);
exit(1);
}
//checks the input file to see if it is empty
if ( (infile= fopen(argv[2], "r")) == NULL)
{
fprintf(stderr,"%s: cannot open %s \n", argv[0], argv[1]);
exit(1);
}
// count the number of charecters in infile
while ( (c = getc(infile)) != EOF)
if ((c != BLANK) && (c != NEWLINE) )
char_count++;
//checks to see if the command is -s or not, outputing the corrct message to the desired location
if (strcmp(argv[1], "-s") == 0)
{
printf("%d characters\n", char_count);
}
else
{
fprintf(outfile, "%s contains %d characters\n", argv[2], char_count);
printf("Result written to %s\n", argv[3]);
}
return 0;
}