贵州建设厅网站首页二级建造师成绩查询十大经典事件营销案例分析

 要生成300亿的文本数据，刚开始用python，实在是太慢了，改成c后速度提升了10几倍，看来干大事还是不能用python。代码留一下，以后可能还可以用上。

#include <stdio.h>
#include <stdlib.h>
#include <time.h>int main(int argc, char *argv[])
{if (argc != 4){printf("[%d]o.exe filename startnum endnum \n",argc);return 1;}srand((unsigned)time(NULL));FILE* pf;char* filename = argv[1];pf = fopen(filename,"w");if (pf != NULL){long i = strtoul(argv[2],NULL,0);long e = strtoul(argv[3],NULL,0);for (;i<=e;i++){double r = ((double)rand() / RAND_MAX) *10000000000;int r1 = rand()%10;fprintf(pf,"INDEXA%ld,2023-08-25,ORG%d,%10.3F\n",i,r1,r);//printf("2023-08-24,INDEXA%ld,ORG%d,%10.3F\n",i,r1,r);}fclose(pf);}return 0;
}

#编译
gcc gen.c#生成300亿行数据
./a.out imp.csv 1 300000000000