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Is there any C library function to check to see if the command line argument is a numerical value or string?

char *ms = av[i];

//how can i check to see if ms is a numerical value?
if ( ms ==...

int read_word(int fld_delim, int rec_delim, int eor_delim, char field[MAXSIZE], FILE *fp) {

int p, i;
p = i = 0;

while ( (p=getc(fp))!= EOF ) {
if( p ==...