7-12

#include<stdio.h>

int main(void)

{

         int i,number;

         char str[10];

         printf("Enter a string:");

         i=0;

         while((str[i]=getchar())!='\n')

                   i++;

         str[i]='\0';

         number=0;

         for(i=0;str[i]!='\0';i++)

                   if(str[i]>='0'&&   str[i]<'9')

                            number=number*10+str[i]-'0';

 

                   printf("digit=%d\n",number);

 

                   return 0;

}