C language High precision subtraction __c language

#include <stdio.h> #include <string.h> int main () {char m[555],n[555];  
    int i,len_m,len_n;  
    int a[555]={0},b[555]={0};  
    scanf ("%s", m);  
    Len_m =strlen (m);  
    for (i=0;i<=len_m-1;i++) a[i]=m[len_m-1-i]-' 0 ';  
    scanf ("%s", n);  
    Len_n=strlen (n);  
    for (i=0;i<=len_n-1;i++) b[i]=n[len_n-1-i]-' 0 ';  
        if (Len_m < Len_n) {printf ("-");  
            for (i=0;i<len_n;i++) {b[i]-=a[i];  
                if (b[i]<0) {b[i]+=10;  
            b[i+1]--;  
        }} i=len_n-1;   
        while (b[i]==0) i--;  
    for (; i>=0;i--) printf ("%d", b[i]);  
            else {for (i=0;i<len_m;i++) {a[i]-=b[i];  
                if (a[i]<0) {a[i]+=10;  
            a[i+1]--; }} i=Len_m-1;   
        while (a[i]==0) i--;  
    for (; i>=0;i--) printf ("%d", a[i]);  
return 0;   }

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