#include <stdio.h>
 
// n個のXを出力する
void writeX(int n) {
    int i;
    for(i = 0; i < n; i++) {
        printf("X");
    }
    printf("\n");
}
 
// 1からkまでXを出力し、そのあと逆順にXを出力する
void triangle(int k) {
    int i;
    for(i = 1; i <= k; i++) {
        writeX(i);
    }
    for(i = k - 1; i >= 1; i--) {
        writeX(i);
    }
}
 
// figure(n)は、1からnまでの段数を順にtriangleで出力
void figure(int n) {
    if(n == 0) {
        return;
    } else {
        figure(n - 1);
        triangle(n);
    }
}
 
int main(void) {
    int n;
    printf("数を入力してください: ");
    if(scanf("%d", &n) != 1) {
        printf("入力エラー\n");
        return 1;
    }
    figure(n);
    return 0;
}
 

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NA==

4