#include
     
      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;}