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POHow to control execution time in C
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copied!<p>I have a C program which will print the prime numbers into a .txt file. I want program to ask me the execution time by minutes. Trying to solve with the piece of code.</p> <pre><code>#include <stdio.h> #include <time.h> int main() { execute(); return(0); } int execute(int minute) { time_t now; time(&now); struct tm *tmp = localtime(&now); printf("How long you want to execute the program by minute? "); scanf("%d",&minute); printf("%d %02d %02d\n",tmp->tm_hour, tmp->tm_min+minute, tmp->tm_sec); return(minute); } </code></pre> <p>and here also is the code that I want to run.</p> <pre><code>#include <stdio.h> int isprime(int x); int main(void) { int AX_REGISTER, BX_REGISTER; FILE *number, *primes; int forever = 1; while (forever) { if ((number = fopen("lastnumber.txt", "r")) == NULL) { fprintf(stderr, "Cannot read LASTNUMBER.txt file.\n"); return 1; } fscanf(number,"%d",&AX_REGISTER); fclose(number); BX_REGISTER=AX_REGISTER; AX_REGISTER=AX_REGISTER+1; if ((number = fopen("lastnumber.txt", "w")) == NULL) { fprintf(stderr, "Cannot write LASTNUMBER.txt file.\n"); return 1; } fprintf(number,"%d\n",AX_REGISTER); fclose(number); if (isprime(BX_REGISTER)) { if ((primes = fopen("primes.txt", "a")) == NULL) { fprintf(stderr, "Cannot open PRIMES.txt file.\n"); return 1; } fprintf(primes,"%d\n",BX_REGISTER); fclose(primes); } } return 0; } int isprime(int x) { int i; for (i=2;i<x;i++) { if (x%i==0) return 0; } return 1; } </code></pre> <p>Since I am a newbie in C programming language I can not solve it by myself. Can someone help me? </p>

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