记录一些遇到代码片段:
去掉字符串末尾多余字符:回车 空格
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| static void clean_string(char * const str) { char *start = str; char *end = str; char *p = str;
while(*p) { switch(*p) { case ' ': case '\r': case '\n': if(str != start) { *start = *p; start++; } break; default: *start = *p; start++; end = start; } p++; } *end = '\0'; }
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生成随机数: 异或
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| static void seedrand_val2() { struct timeval tv; unsigned int rand_val = 0;
gettimeofday(&tv, NULL);
rand_val = tv.tv_sec^tv.tv_usec^getpid();
printf("%s: rand_val=%d\n", __func__, rand_val); }
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伪随机数:rand
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| srand((unsigned)time(NULL));
#define MIN_BANDWIDTH 60 #define MAX_BANDWIDTH 200 #define random() (MIN_BANDWIDTH + (int)((double)rand() / ((double)RAND_MAX+1.0) * (MAX_BANDWIDTH - MIN_BANDWIDTH)))
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随机范围:60~200
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