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Hello, I'm writing the simple code as below #include <stdio.h> #include <stdlib.h> int main() { FILE *fp; float x,y; int n; int errno = 0; int i; fp=fopen("test_numbers.dat","w"); for(i=1;i<=10;i++) fprintf(fp,"%d %d\n",i,i*i); fclose(fp); fp=fopen("./test_numbers.dat","r"); if(fp==NULL); printf("File cannot be opened\n"); fclose(fp); return 0; } and save it as main.c I'm compiling the … 
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