Thread: Help with adding two numbers taken as Strings !!

Hey,

I was trying to solve a problem that required to add one hundred 50 digit numbers. Since there is no way to hold such a huge number. I read that storing them in strings is the way to go. Unfortunately, I was caught midway while trying to do the same.

Here's the source code;

Code:

#include<stdio.h>
#include<string.h>
const char * addTwoStrings(char *number1,char *number2)
{
	int i = strlen(number1);
	printf("%s\n",number1);
	printf("%d\n",i);
	return "hello";
}


int main(void)
{
	char filename[] = "inputNumbers.txt";
	FILE *FP;
	char c;
	int i=0,j=0;
	char string[2][9] = {'\0'};
	FP = fopen(filename,"r");
	if(FP ==NULL)
		{
			printf("Error opening file");
			return 0;
		}
	while((c= fgetc(FP)) != EOF)
		{
			if(c == '\n')
				{
					i++;
					j=0;
					continue;
				}		
			string[i][j++] = (char)c;
		}
	addTwoStrings(string[0],string[1]);	
/*	for(i=0;i<2;i++)
		{
			for(j=0;j<9;j++)
				{
					printf("%d",string[i][j]-'0');
				}
			printf("\n");
		}*/
	return 0;
}

And the text file is this.

Code:

123465789
321654987

This isn't the exact huge number, but I wanted to try it out with lower number before trying out with the original huge ones.

As you can see, I am trying to store the numbers in a two-dimensional array. However when I and try to pass the single number as an parameter to the AddTwoStrings() method, It actually passes the entire number as such.

When I pass string[0],string[1] it should pass the first and second number from the files as the two numbers instead of the whole number as such.

The function AddTwoStrings() doesn't do anything as of now, I encountered this error when I was testing the code till this part.

Thanks.