Array and nested for loop not showing required result

Question

#include<iostream>
using namespace std;
void f_1(int x){
if(x==0)
cout<<"Salary account opened \n";
else if(x==1)
cout<<"Savings account opened \n";
else
cout<<"Something went wrong, try again \n";
}
void f_2(float x,int p){ if(p==0){
if(x>=500){
cout<<"Amount of "<<x<<" only is added to your salary account \n";}}
else if(p==1){
cout<<"Amount of "<<x<<" only is added to your savings account \n";}
}
void f_3(float x){
int fm = x*2/100;
cout<<"Money in savings account in next 5 months respectively"<<endl;
int arr[5]={4,5,6,7,8};

for(int i=0;i<=4;i++){
for(int j=0;j<=n;j++){
x=x+fm;
cout<<x<<endl;
cout<<"month "<<arr[j]<<"money"<<x;}
}}
void f_4(float f){
int arr[5]={4,5,6,7,8};
cout<<"Money in salary account in next 5 months respectively "<<endl;
for(int i=0;i<=2;i++){
for(int j=0;j<=i;j++){
int z=0+f;
cout<<"month "<<arr[j]<<endl;
cout<<"money "<<z<<endl;
}}

}
int main(){
int a,b,c,d;
cout<<"Press 0 to open salary account "<<endl;
cin>>a;
f_1(a);
if(a==0){
cout<<"Deposit money atl

Answer 1

I want the output as:
Month number and money in that month