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Variable declarations in while loop conditions are also C++-only.
// Due to the declaration in the while-condition, this must be compiled as C++. // C99 supports declarations in the initializer of a for loop, but not in if // and while. See ISO/IEC 9899:1999 6.8.5 Iteration statements. (A freely // available DRAFT: http://www.open-std.org/jtc1/sc22/wg14/www/docs/n1256.pdf.) #include <stdio.h> #include <stdlib.h> #include <time.h> int main(void) { enum { maxval = 9 }; printf("Here's a handful of \"random\" numbers from 1 to %d:\n", maxval); srand((unsigned)time(NULL)); while (const int n = rand() % (maxval + 1)) printf("%d\n", n); puts("Done."); }
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