段错误（吐核）有关整理字符串数组中得整数！

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

int main()
{

int i;
int j,k,n,el,sum;
char *s;
int a[100]={0};

scanf("%s",&s);
j=sum=n=0;
el=1;
char *p=s;

while(*s !='\0')
{
p=s;
while(*p>='0' && *p <= '9')
{
j++;
p++;
}
if(j>0)
{
for(j=j-1;j>=0;j--)
{
sum+=((*(s+j)-48)*el);
el=el*10;
}
a[n]=sum;
printf("%d\n",a[n]);
n++;
j=0;
sum=0;
el=1;
}
s=p;
if(*s !='\0')
{
s++;
}
}

for(i=0;i<n;i++)
{
printf("%d",*(a+i));
}
printf("the number of integers is %d\n",n);
return 0;

}