C Language Programming classic example of nine

Topic: 809*? =800*?? +9*?? +1 of them?? Representative of the two digits, 8*?? The result is two digits, 9*?? The result is a 3-digit number. Please?? Representative of the two digits, and 809*?? After the result.

1. Procedure Analysis:

2. Program Source code:

output(long b,long i)
{
　printf("\n%ld/%ld=809*%ld+%ld",b,i,i,b%i);
}
main()
{
　long int a,b,i;
　a=809;
　for(i=10;i<100;i++)
　{
　　b=i*a+1;
　　if(b>=1000&&b<=10000&&8*i<100&&9*i>=100)
　　　output(b,i);
　}
}

"Program 82"

Title: Octal Conversion to decimal

1. Procedure Analysis:

2. Program Source code:

main()
{
　char *p,s[6];int n;
　p=s;
　gets(p);
　n=0;
　while(*(p)!='\0')
　{
　　n=n*8+*p-'0';
　　p++;
　}
　printf("%d",n);
}