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fileHandling.c

@@ -0,0 +1,52 @@
+/*This code shows the use of file handling which is
+ *very useful when it comes to projects in C
+*/
+#include<stdio.h>
+#include<stdlib.h>
+#include<math.h>
+int primeTest(int n)
+{
+    int j,flag=-1;
+    for(j=2;j<=sqrt(n);j++)
+    {
+        if(n%j==0)
+        {
+            flag=1;
+            break;
+        }
+    }
+    if(flag==1)
+        return 0;
+    else
+        return 1;
+}
+int main()
+{
+    int i;
+    char c;
+    FILE *src,*trg;
+    src=fopen("source.txt","w");
+    if(src==NULL)
+    {
+        printf("ERROR IN OPENING FILE\n");
+        return 0;
+    }
+    for(i=1001;i<10000;i++)
+        fprintf(src,"%d ",i);
+    fclose(src);
+    trg=fopen("target.txt","w");
+    src=fopen("source.txt","r");
+    if(trg==NULL || src==NULL)
+        {
+            printf("ERROR IN OPENING FILE\n");
+            return 0;
+        }
+
+    while((fscanf(src,"%d",&i))!=-1)
+    {
+        if(primeTest(i))
+            fprintf(trg,"%d ",i);
+    }
+    fclose(src);
+    fclose(trg);
+}