C/C++: Frequency Distribution

The first 40 raw data of Systolic Blood pressure (in mmHg) of Simplified Biostatistics by Abubakar S. Asaad is utilize in the demonstration below.

Output:

C Codes:

	#include <stdio.h>
	#include <math.h>
	int main()
	{
	int i, j, n, nci, freq = 0;
	float temp, min, max, range, interval, cibase;
	printf("Enter the Sample Size: ");
	scanf("%d", &n);
	float x[n];
	printf("Enter the Data: ");
	for(i = 0; i < n; ++i){
	scanf("%f", &x[i]);
	}
	printf("\n");
	printf("Number of Class Interval (7 - 20): ");
	scanf("%d", &nci);
	if(nci >= 7 && nci <= 20){
	for(i = 0; i < n; ++i){
	for(j = 1 + i; j < n; ++j){
	if(x[i] > x[j]){
	temp = x[i];
	x[i] = x[j];
	x[j] = temp;
	}
	}
	}
	printf("\n");
	min = x[0];
	max = x[n - 1];
	range = max - min;
	interval = ceil(range / nci);
	printf(" Class Interval \t");
	printf(" Freq \t");
	printf(" Class Boundary \t");
	printf(" Class Mark \n");
	cibase = min;
	while(cibase <= max){
	printf("%5.0f - %4.0f\t\t", cibase, (cibase - 1) + interval);
	freq = 0;
	for(i = 0; i < n; ++i){
	if(x[i] >= cibase && x[i] <= ((cibase - 1) + interval)){
	++freq;
	}
	}
	printf("%4d\t", freq);
	printf("%6.1f - %6.1f\t\t", cibase - 0.5, (cibase - 0.5) + interval);
	printf("%9.1f\t", (cibase + ((cibase - 1) + interval)) / 2);
	printf("\n\n");
	cibase = cibase + interval;
	}
	printf("Minimum: %6.1f\n", min);
	printf("Maximum: %6.1f\n", max);
	printf("Range: %6.1f\n", range);
	printf("Interval: %6.1f\n", interval);
	}
	else{
	printf("ERROR: Choose Between 7 and 20\n");
	printf("Try Again!\n");
	}
	return 0;
	}

view raw freqdist.c hosted with ❤ by GitHub

C++ Codes:

	#include <iostream>
	#include <iomanip>
	#include <math.h>
	using namespace std;
	int main()
	{
	int i, j, n, nci, freq = 0;
	float temp, min, max, range, interval, cibase;
	cout << "Enter the Sample Size: ";
	cin >> n;
	float x[n];
	cout << "Enter the Data: ";
	for(i = 0; i < n; ++i){
	cin >> x[i];
	}
	cout << endl;
	cout << "Number of Class Interval (7 - 20): ";
	cin >> nci;
	if(nci >= 7 && nci <= 20){
	for(i = 0; i < n; ++i){
	for(j = 1 + i; j < n; ++j){
	if(x[i] > x[j]){
	temp = x[i];
	x[i] = x[j];
	x[j] = temp;
	}
	}
	}
	cout << endl;
	min = x[0];
	max = x[n - 1];
	range = max - min;
	interval = ceil(range / nci);
	cout << " Class Interval \t";
	cout << " Freq \t";
	cout << " Class Boundary \t";
	cout << " Class Mark " << endl;
	cibase = min;
	while(cibase <= max){
	cout.width(5); cout << right << cibase << " - ";
	cout.width(4); cout << right << (cibase - 1) + interval << "\t\t";
	freq = 0;
	for(i = 0; i < n; ++i){
	if(x[i] >= cibase && x[i] <= ((cibase - 1) + interval)){
	++freq;
	}
	}
	cout.width(4); cout << right << freq << "\t";
	cout.width(6); cout << right << cibase - 0.5 << " - ";
	cout.width(5); cout << right << (cibase - 0.5) + interval << "\t\t";
	cout.width(9); cout << right << (cibase + ((cibase - 1) + interval)) / 2 << "\t";
	cout << "\n" << endl;
	cibase = cibase + interval;
	}
	cout.width(6); cout << "Minimum: " << setprecision(5) << right << min << endl;
	cout.width(6); cout << "Maximum: " << setprecision(5) << right << max << endl;
	cout.width(6); cout << "Range: " << setprecision(5) << right << range << endl;
	cout.width(6); cout << "Interval: " << setprecision(5) << right << interval << endl;
	}
	else{
	cout << "ERROR: Choose Between 7 and 20" << endl;
	cout << "Try Again!" << endl;
	}
	return 0;
	}

view raw freqdist.cpp hosted with ❤ by GitHub