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Asked: 2026-06-12T11:24:47+00:00

I am getting g++ -O3 cache-l1-line.cpp -o cache-l1-line -lrt cache-l1-line.cpp: In function ‘int main()’:

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I am getting 

g++ -O3 cache-l1-line.cpp -o cache-l1-line -lrt
cache-l1-line.cpp: In function 'int main()':
cache-l1-line.cpp:33:58: warning: format '%d' expects argument of type 'int', but argument 2 has type 'long unsigned int' [-Wformat]

On my schools sunfire server … but not my my machine (Arch Linux). Why might that be. The line in question seems to be 

printf("%d, %1.2f \n", i * sizeof(int), totalTime/TIMES);

Where i is defined: 

for (int i = 4; i <= MAX_STRIDE/sizeof(int); i*=2)  {

Whats the problem: full source on GitHub (link to revision)

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1 Answer

  1. Editorial Team

    In a 64-bit architecture expressions evaluate to 64-bit. Thus the proper specifier in that architecture would be %llu. Or conversely the expression should be casted to the width and type expected by the specifier %d.

    EDIT: %llu instead of %lld — thanks for comment.

    The expression (i * size_t) has different width and type in different architectures;
    it’s (unsigned int) apparently in your i3 -system and (unsigned long long) in your i7 -system.

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