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#include <stdio.h>
int main(int argc, char const* argv[]) {
for (int i = 1; i < 3; i++) {
for (int j = 1; j <= i; j++) {
twoNumAdd(i, j); // help.c的外部函数
// _show_sum(i, j, i + j);
// 不能调用，它是static函数，是help.c的内部函数
}
return 0;