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#include <stdio.h> int main() { char buf[1024]; size_t nIn = sizeof(buf); while (nIn == sizeof(buf)) { nIn = fread(buf, 1, sizeof(buf), stdin); if (nIn > 0) { size_t nOut; nOut = fwrite(buf, 1, nIn, stdout); if (nOut != nIn) { return 1; } } } return 0; }