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#include <stdio.h> char *print_msg(int a, int b, int c) { int ns = 0; if (a==b) ns++; if (b==c) ns++; if (c==a) ns++; switch(ns) { case 3: return "正三角形"; case 1: return "二等辺三角形"; case 0: return "不等辺形"; default: printf("エラー! ns=%d\n", ns); } return ""; } void main(int argc, char **argv) { //int a = atoi(argv[1]); //int b = atoi(argv[2]); //int c = atoi(argv[3]); int a,b,c; a=-1;b=-1;c=-1; printf("%sです\n", print_msg(a,b,c)); }
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