Improve the following program so that the user can only enter positive numbers otherwise it will show that it is an error and let the user try again. In addition to repeating several times the message to enter a number, until the user decides that he/she does not want to enter any more numbers.

#include

int main(){ FILE *archive; char c[100]; int number,n; int i; archive = fopen("archive.txt","a+t");//a i=1; if(archive==NULL){ printf(" Error opening the file"); exit(1); } //Request the user to enter positive S/Ns and write them to a file do{ printf("Enter a number: "); scanf("%i",number); fprintf(archive,"%d",number); }while(number>0); rewind(archive);

while(! feof(archive)){ fscanf(archive,"%d",&n); printf("%d",n); } fclose(archive); }