add SCR Part

SCR/SCR3.1/TP01/Exercise4/crible.c

@@ -0,0 +1,44 @@
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/mman.h>
+#include <unistd.h>
+
+void afficher(char* crible, int n) {
+    for(int i = 0; i < n; i++) {
+        if(crible[i]) printf("%d ", i);
+    }
+
+    printf("\n");
+}
+
+void rayer_multiples(char* crible, int n, int k) {
+    for(int i = 0; i < n; i++) {
+        if(i % k == 0 && i != k) crible[i] = 0;
+    }
+}
+
+
+int main(int argc, char **argv)
+{
+    int n=1000;
+    if(argc>1){
+        n = (int)strtol(argv[1],NULL,0);
+        assert( n > 0 );
+    }
+    
+    char* crible = (char*)mmap(NULL, n * sizeof(int), PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_SHARED, -1, 0);
+    assert(crible != MAP_FAILED);
+
+    for(int i=0; i<n; i++){
+        crible[i] = 1;//par défaut: pas encore barré
+    }
+    
+    for(int k=2; k<n; k++){
+        rayer_multiples(crible, n, k);
+    }
+
+    afficher(crible, n);
+    
+    return 0;
+}