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- 1.1. 각 자리 수 더하기 ¶
Write a program that reads a four digit integer and prints the sum of its digits as an output.
- Simple Implementation
#include <stdio.h>
#include <math.h>
int main(){
int four_digit_num, sum = 0, i, positional;
scanf("%d", &four_digit_num);
for(i = 3; i >= 0; i--){
positional = pow(10, i);
sum += four_digit_num / positional;
four_digit_num %= positional;
}
printf("%d\n", sum);
return 0;
}
- Basic Implementation
#include <stdio.h>
int main(){
int four_digit_num, sum = 0, i, positional, j;
scanf("%d", &four_digit_num);
for(i = 3; i >= 0; i--){
positional = 1;
for(j = 0; j < i; j++){
positional *= 10;
}
sum += four_digit_num / positional;
four_digit_num %= positional;
}
printf("%d\n", sum);
return 0;
}
- Advanced Implementation
#include <stdio.h>
#include <math.h>
int main(){
int n_digit_num, sum = 0, positional, n;
scanf("%d", &n_digit_num);
n = log10(n_digit_num);
if((n_digit_num >= pow(10, n)) && (n_digit_num < pow(10, n+1))){
for(; n >= 0; n--){
positional = pow(10, n);
sum += n_digit_num / positional;
n_digit_num %= positional;
}
printf("%d\n", sum);
return 0;
}
exit(1);
}
1.2. 별찍기 ¶
#include <stdio.h>
int main()
{
int i,j;
for (i = 0; i < 5; i++) {
for (j = 4; j > i; j--) printf(" ");
for (j = 0; j < 2*i+1; j++) printf("*");
printf("\n");
}
return 0;
}
1.3. 원리합계 구하기 ¶
Write a program that gets a starting principal(A, 원금), annual interest rate(r, 연이율) from a keyboard (standard input) and print the total amount on deposit (예치기간이 지난 뒤 총금액, 원리합계) for the year(n) from 0 to 10. total deposit = A*(1+r)^n
#include <stdio.h>
int main(){
double a, r, interest = 1;
int n;
scanf("%lf %lf", &a, &r);
for(n = 0; n <= 10; n++){
printf("%d\t%.2f\n", n, a * interest);
interest *= 1+r;
}
return 0;
}
