to calculate the exponent of a power number

음냐리~ 공부하려고 한 거 아닌데... 계산기 찾는 것보다 코딩하는 게 더 간편하게 느껴져서. 쿄쿄.

//exponentiation for a number

#include <iostream>

char line[100];    // input data
int number;    // a number converted from input
int exponent = 0;   
int base = 2;

int main (int argc, char * const argv[]) {
    // to get a number from a user
    printf("Enter a number    :    ");
    fgets(line, sizeof(line), stdin);
   
    // to convert input data to number
    number = atoi(line);
   
    // to calculate its exponent on the base
    int i;
    for (i=0; number>1; i++)
    {
        number /= base;
        exponent = i+1;
    }
    printf("base %d to the %d-th power\n", base, exponent);
       
    return 0;
}

실행창:

Enter a number    :    65536
base 2 to the 16-th power

업그레이드 버전:

//exponentiation for a number

#include <iostream>

char line[100];    // input data
int number;    // a number converted from input
int exponent = 0; // exponent number to be calculated   
int base = 2; // base to power

int main (int argc, char * const argv[]) {
    while(1)
    {
        // to get a number from a user
        printf("Enter a number    :    ");
        fgets(line, sizeof(line), stdin);
       
        if (line[0]==10)    // no input but enter
            break;    // exit
        else
        {
        // to convert input data to number
            number = atoi(line);
           
            // to calculate its exponent on the base
            int i;
            int flag = 0; // indicator
            int origin = number; //to reserve the input number
            for (i=0; number>=base; i++)
            {
                int remainder = number % base;
                if (remainder != 0) //not power based on base number
                {   
                    printf("%d does not have %d-based power.\n", origin, base);
                    flag = 1; //error to calculate exponentiation
                    break;
                }
                else
                {   
                    number /= base;               
                    exponent = i+1;
                }
            }
            if (flag==1) //error
                continue;
            else if(flag==0)
                printf("base %d to the %d-th power\n", base, exponent);
        }
    }
        return 0;
}

실행창:

Enter a number    :    65536
base 2 to the 16-th power
Enter a number    :    2
base 2 to the 1-th power
Enter a number    :    3
3 does not have 2-based power.
Enter a number    :    256
base 2 to the 8-th power
Enter a number    :    255
255 does not have 2-based power.
Enter a number    :   

expon has exited with status 0.

아 놔~ 나 숙제 안 하고 뭐하고 있는 거지? 열도 안 떨어지는구만. ㅜㅜ