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#include <stddef.h>
#include <stdio.h>
#include <string.h>
 
int ratoi(const char *romstr)
{
	const numdigits = 8;
//	const char digits[numdigits] = "IVXLCDM";
	int count[numdigits] = { 0,0,0,0,0,0,0,0 };
	const int value[numdigits] = { 0, 1, 5, 10, 50, 100, 500, 1000 };
	unsigned char mapper[26] = { 0,0,5,6,0,0,0,0,1,0,0,4,7, 0,0,0,0,0,0,0,0,2,0,3,0,0 };
	int retval = 0;
 
	int lp;
 
	while (*romstr)
	{
		int mapval = *romstr - 'A';
		int mapped = mapper[mapval];
		int mappedvalue = value[mapped];
 
		retval += value[mapped];
		if (mapped < numdigits - 1)
			count[mapped + 1] -= 2 * mappedvalue;
		if (mapped < numdigits - 2
			count[mapped + 2] -= 2 * mappedvalue;
		romstr++;
	}
 
	return retval;
}
 
 
int main(int argc, char **argv)
{
 
   char* const input = "MCMXCIX";
    printf("ratoi(%s) = %u\n", input , ratoi(input));
 
	return 0;
}
 

cc1: warnings being treated as errors
prog.c: In function ‘ratoi’:
prog.c:8: error: type defaults to ‘int’ in declaration of ‘numdigits’
prog.c:10: error: variable-sized object may not be initialized
prog.c:10: error: excess elements in array initializer
prog.c:10: error: (near initialization for ‘count’)
prog.c:10: error: excess elements in array initializer
prog.c:10: error: (near initialization for ‘count’)
prog.c:10: error: excess elements in array initializer
prog.c:10: error: (near initialization for ‘count’)
prog.c:10: error: excess elements in array initializer
prog.c:10: error: (near initialization for ‘count’)
prog.c:10: error: excess elements in array initializer
prog.c:10: error: (near initialization for ‘count’)
prog.c:10: error: excess elements in array initializer
prog.c:10: error: (near initialization for ‘count’)
prog.c:10: error: excess elements in array initializer
prog.c:10: error: (near initialization for ‘count’)
prog.c:10: error: excess elements in array initializer
prog.c:10: error: (near initialization for ‘count’)
prog.c:11: error: variable-sized object may not be initialized
prog.c:11: error: excess elements in array initializer
prog.c:11: error: (near initialization for ‘value’)
prog.c:11: error: excess elements in array initializer
prog.c:11: error: (near initialization for ‘value’)
prog.c:11: error: excess elements in array initializer
prog.c:11: error: (near initialization for ‘value’)
prog.c:11: error: excess elements in array initializer
prog.c:11: error: (near initialization for ‘value’)
prog.c:11: error: excess elements in array initializer
prog.c:11: error: (near initialization for ‘value’)
prog.c:11: error: excess elements in array initializer
prog.c:11: error: (near initialization for ‘value’)
prog.c:11: error: excess elements in array initializer
prog.c:11: error: (near initialization for ‘value’)
prog.c:11: error: excess elements in array initializer
prog.c:11: error: (near initialization for ‘value’)
prog.c:27: error: expected ‘)’ before ‘count’
prog.c:29: error: expected expression before ‘}’ token
prog.c:15: error: unused variable ‘lp’

Standard output is empty