#include<stdio.h>
#include<string.h>
需要从字符串里依次把数字和运算符分别挑出，赋值。例如我输入54+53-52*51/50，给g1=54，g2=53，g3=52，g4=51，g5=50，运算符以新字符串形式输出，即+-*/。
求高手帮助啊。
#include<iostream>
using namespace std;
#define N 100
void main()
{   
    char a[N],r[100],w[100],e[100];
    int g1=0,g2=0,g3=0,g4=0,i,t,b,l=0;
    printf("输入计算公式的长度\n");
    scanf("%d",&b);
    printf("输入计算公式\n");
    scanf("%s",a);
    for(i=0;i<b;i++)
    {
        if(a[i]>=48 && a[i]<=57)
        {
            t=(a[i]-48);
            g1=g1*10+t;
            l++;
        }
        else
        {
            r[100]=a[i];
            for(i=l+1;i<b;i++)
            {
                    if(a[i]>=48 && a[i]<=57)
                    {
                        t=(a[i]-48);
                        g2=g2*10+t;
                        l++;
                    }
                    else
                    {
                        w[100]=a[l+1];
                        for(i=l+2;i<b;i++)
                        {
                            if(a[i]>=48 && a[i]<=57)
                            {
                                t=(a[i]-48);
                                g3=g3*10+t;
                                l++;
                            }   
                            else
                            {
                                e[100]=a[l+2];
                                for(i=l+3;i<b;i++)
                                {
                                    if(a[i]>=48 && a[i]<=57)
                                    {
                                        t=(a[i]-48);
                                        g4=g4*10+t;
                                        l++;
                                    }
                                }   
                            }
                        }   
                    }
            }
        }
    }   
}

思路是依次找出其中的合法数字