最简单的做法，是三层循环(只要整数的话)
for (a=1; a<=100; a++){ for (b=1; b<=100; b++){ for (c=1; c<=100; c++){ if(a*a+b*b==c*c){ printf("a=%d, b=%d, c=%d\r\n", a, b, c); } } }}
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