C programlamadan anlayan arkadaşlar bakabilir mi?

 
 #include<stdio.h> 
  
 int main() 
 { 
 	char mesaj[100], harf; 
 	printf("Mesaji giriniz (en fazla 100 karakter): "); 
 	gets(mesaj); 
 	 
 	printf("Harfi giriniz: "); 
 	scanf("%s", &harf); 
 	 
 	int sayac=0; 
 	for(int i=0; i<100; i++) 
 	{ 
 		if(mesaj[i]==harf) 
 		{ 
 			sayac++; 
 			printf("%d.sirada\n", i+1); 
 		} 
 	} 
 	printf("TOPLAM %d tane %c harfi var.\n\n", sayac, harf); 
 	 
 	char cevap, yeniHarf; 
 	printf("Harfi degistirmek ister misiniz? (e/h): "); 
 	scanf(" %c", &cevap); 
 	 
 	if(cevap=='e') 
 	{ 
 		printf("Yeni harfi giriniz: "); 
 		scanf(" %c", &yeniHarf); 
 		for(int i=0; i<100; i++) 
 		{ 
 			if(mesaj[i]==harf) 
 			{ 
 				mesaj[i]=yeniHarf; 
 			} 
 		} 
 		printf("%s", mesaj); 
 	} 
 	 
 	 
 	return 0; 
 } 
 

 
 #include<stdio.h> 
 #include<math.h> 
  
 int main() 
 { 
 	double sayi; 
  
 	printf("ondalikli sayi giriniz: "); 
 	scanf("%lf", &sayi); 
  
 	while(sayi!=((int)sayi)) 
 	{ 
 	    sayi=sayi*10; 
 	} 
 	printf("%d", (int)sayi); 
 		 
 	return 0; 
 } 
 

 
 #include<bits/stdc++.h> 
 using namespace std; 
  
 bool ison(int i, int x)  
 { 
 	if ((i >> x) & 1) 
 		return true; 
 	return false; 
 } 
  
 int main() { 
 	cout<<"enter the number of elements  : ";  
 	int n; 
 	cin >> n; 
 	int a[n]; 
 	for (int i = 0; i < n; i++) 
 		cin >> a[i]; 
 	int sumarr1[(1 << n) - 1]; 
 	int sumarr2[(1 << n) - 1]; 
 	 
 	memset(sumarr1, 0, sizeof(sumarr1)); 
 	memset(sumarr2, 0, sizeof(sumarr2)); 
 	 
 	int index = 0; 
 	 
 	vector<int>v1[(1 << n) - 1]; 
 	vector<int>v2[(1 << n) - 1]; 
 	 
 	for (int i = 1; i < (1 << n); i++) 
 	{ 
 		for (int j = 0; j < n; j++) 
 		{ 
 			if (ison(i, j)) 
 			{ 
 				sumarr1[index] += a[j]; 
 				v1[index].push_back(a[j]); 
 			} 
 			else { 
 				sumarr2[index] += a[j]; 
 				v2[index].push_back(a[j]); 
 			} 
 		} 
 		index++; 
 	} 
 	 
 	int ans = INT_MAX; 
 	int ii; 
 	 
 	for (int i = 0; i < index; i++) 
 	{ 
 		if (abs(sumarr1[i] - sumarr2[i]) < ans) 
 		{ 
 			ii = i; 
 			ans = abs(sumarr1[i] - sumarr2[i]); 
 		} 
 	} 
 	 
 	cout << "first partitioned array : "; 
 	for (int i = 0; i < v1[ii].size(); i++) 
 	{ 
 		cout << v1[ii][i] << " "; 
 	} 
 	cout << endl; 
 	 
 	cout << "2nd partitioned array : ";	 
 	for (int i = 0; i < v2[ii].size(); i++) 
 	{ 
 		cout << v2[ii][i] << " "; 
 	}	 
 	cout << endl; 
 	 
 	cout << "minimum difference is : " << ans << endl; 
 }