I want to add between large numbers, but it gives an error. I am using a char array. There is an error on line 55. [Error] subscripted value is neither array nor pointer nor vector

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


int chrtoint(char a){
    int i;
    for (i = 48; i<=57; i  )
    if (toascii(i)==a) return i-48;
    return 0;
}

void main(){
    char n1[80];
    char n2[80];

    
    printf("Enter First Number:");
    scanf("%s", &n1);
    printf("\nEnter Second Number:");
    scanf("%s", &n2);
    
    sumNumber(n1 , n2);


}

void sumNumber(char n1 , char n2){
    
    int rs[80];
    int c1, c2;

    int i,j,m, cmax, sum;
    c1 = strlen(n1);
    c2 = strlen(n2);

    strrev(n1);
    strrev(n2);
    
    cmax = c1;
    if(c1<c2){
        cmax = c2;
    }

    m=0;
    for(i=0; i< cmax; i  ){
    if(c1==c2 || (i < c1 && i < c2)){
    sum = m chrtoint(n1[i]) chrtoint(n2[i]); // error is given in this line
    }else if(i >=c1){
    sum = m chrtoint(n2[i]);
    }else if(i >=c2){
    sum = m chrtoint(n1[i]);
    }
    rs[i] = sum;
    m = sum/10;
    }
    
    if(m){
    rs[i]=m;
    i  ;
    }

    printf("\nResult: ");
    for(j=0; j < i; j  ){
        printf("%d", rs[i-j-1]);
    }
}

I apologize if I have asked the same question. This is the first time I am posting a question on this site. Please tell me if there is something wrong.

CodePudding user response：

Your compiler should be displaying several warning and error messages.

First, either add a prototype to the function void sumNumber(char n1, char n2) or move it above main. Speaking of which, your main function prototype is not good practice (in some compilers it is illegal); it should be int main(void) or int main(int argc, char *argv[]).

Here:

void sumNumber(char n1, char n2)

These variables are declared in your main function as arrays of characters so the parameters of sumNumber should be either arrays of characters:

void sumNumber(char n1[], char n2[])

or pointers to characters:

void sumNumber(char *n1, char *n2)

One more thing, in these lines:

 scanf("%s", &n1);
 scanf("%s", &n2);

you are passing pointer to an array of 80 characters, which is invalid; it should be

scanf("%s", n1);
scanf("%s", n2);

Correct these errors and your program should run fine.

CodePudding user response：

when we define array of char to be used as string ( we don't scan it with address ) because String in most programing language is already considered as an address (reference pointer )