#include <stdio.h>

int main() {
    int i;
    for(i=1;i<=10;i++){ //선언, 조건, 증감
        //실행할 명령어
        printf("%d\n", i);
    }
    
    for(i=1;i<11;i+=2){
        printf("%d\n", i);
    }

    for(i=10;i>=1;i-=2){
        printf("%d\n", i);
    }

    int sum = 0;
    for(i=1;i<=30;i+=2){
        sum += i;
    }
    printf("%d\n", sum);

    for(i=1;i<=9;i++){
        printf("%d x %d = %d\n", 2, i, 2*i);
    }
    
}

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