回答編集履歴
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ソース追記
test
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@@ -3,3 +3,139 @@
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“九九表”で検索しましょう。
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[C言語で九九表](https://teratail.com/questions/27627)
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答えになってしまいますが・・・
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```text
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usr ~/Project/test % ./a.out
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開始： 1
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終了： 9
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1 2 3 4 5 6 7 8 9
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2 4 6 8 10 12 14 16 18
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3 6 9 12 15 18 21 24 27
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4 8 12 16 20 24 28 32 36
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5 10 15 20 25 30 35 40 45
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6 12 18 24 30 36 42 48 54
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7 14 21 28 35 42 49 56 63
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8 16 24 32 40 48 56 64 72
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9 18 27 36 45 54 63 72 81
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usr ~/Project/test % ./a.out
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開始： 2
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終了： 2
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2 4 6 8 10 12 14 16 18
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usr ~/Project/test % ./a.out
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開始： 6
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終了： 5
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5 10 15 20 25 30 35 40 45
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6 12 18 24 30 36 42 48 54
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usr ~/Project/test %
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```
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usr ~/Project/test % cat t1.c
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```c
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#include <stdio.h>
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#include <stdlib.h>
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// scanf()は問題が多いため数字を入力する為の関数（エラーチェックはしていない）
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int getNum(void);
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int main(void)
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{
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fputs("開始： ", stdout);
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int start = getNum();
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fputs("終了： ", stdout);
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int end = getNum();
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if (end < start) {
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int tmp = start;
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start = end;
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end = tmp;
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}
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for (int row = start; row <= end; row++) {
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for (int col = 1; col <= 9; col++) {
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printf("%3d", row * col);
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}
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putchar('\n');
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}
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return 0;
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}
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int getNum(void)
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{
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char buf[256];
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fgets(buf, sizeof buf, stdin);
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int ret = (int)strtol(buf, 0, 10);
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return ret;
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}
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```
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usr ~/Project/test %
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