Write a program to determine if the parameter you enter is a .txt file name. C L

Question

Write a program to determine if the parameter you enter is a .txt file name. C LANGUAGE for example: #include int main( int argc, char *argv[] ) { if( argc == 2) printf("The parameter is a %s file name. ", argv[1]); else if( argc > 2 ) printf("There should be only one additional parameter. "); else ??? dont know the condition for this :S printf("The parameter is not a .txt file name. "); system("PAUSE"); return 0; } The only one I cannot get to work is the last one, if the parameter is not a .txt file name. HELP will rate you lifesaver!!!

Explanation / Answer

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

int main( int argc, char *argv[] )
{
    if(argc == 2)
    {
        const char * filename = argv[1];
        int l = strlen(argv[1]);
        if (*(filename + l - 3) == 't' &&
            *(filename + l - 2) == 'x' &&
            *(filename + l - 1) == 't')
        {
            printf("The parameter is a txt file name. ");
        }
        else
        {
            printf("The parameter is not a txt file name. ");
        }
    }
    else if( argc > 2 )
    {
        printf("There should be only one additional parameter. ");
    }
    else
    {
        printf("no parameter "); //this is the case when argc = 1
    }
    return 0;
}

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