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#include<stdlib.h>
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// implementation of memcmp
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int memcmp ( void *a, void *b, size_t n){
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unsigned int i;
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for ( i = 0; i < n ; i++) {
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char *a1 = a + i;
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char *b1 = b + i;
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char return_value = *a1 - *b1;
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if( return_value != 0)
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return (int)return_value;
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}
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return 0;
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}
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