C Programming Tutorial by Wang Jinghua: Solutions and Explanations286

Wang Jinghua's C programming tutorial is a popular resource for learners aiming to grasp the fundamentals of C language. However, the true learning comes not just from reading the textbook but from actively engaging with the exercises and understanding the solutions. This post provides comprehensive explanations and solutions to selected problems from Wang Jinghua's C programming tutorial. It's designed to help you solidify your understanding, identify common pitfalls, and improve your problem-solving skills. We’ll delve into several example problems, focusing on the logic, the code implementation, and potential alternative approaches.

Note: Since I don't have access to a specific version of Wang Jinghua's C programming tutorial, the examples below are illustrative. They represent common types of problems encountered in introductory C programming courses and are designed to be analogous to the problems found in such tutorials. If you have a specific problem from the tutorial you'd like explained, please provide the problem statement, and I'll do my best to assist.

Example 1: Calculating the average of n numbers

A common early exercise involves calculating the average of a given set of numbers. Let's say the problem asks you to write a program that takes an integer 'n' as input, followed by 'n' numbers, and then outputs the average.

A naive approach might be to use an array. However, a more memory-efficient method (especially for very large 'n') is to calculate the sum iteratively and divide by 'n' at the end:```c
#include
int main() {
int n, i;
float num, sum = 0.0;
float average;
printf("Enter the number of elements: ");
scanf("%d", &n);
if (n 0). Then it iterates through the input numbers, accumulating the sum. Finally, it calculates and prints the average. Note the use of `float` for `sum` and `average` to handle potential decimal values.

Example 2: Finding the largest and smallest number in an array

Another frequently encountered problem is finding the largest and smallest elements within an array. This exercise reinforces the understanding of loops and conditional statements.```c
#include
#include // For INT_MAX and INT_MIN
int main() {
int n, i;
int arr[100]; // Assuming a maximum of 100 elements
int largest = INT_MIN; // Initialize with the smallest possible integer
int smallest = INT_MAX; // Initialize with the largest possible integer
printf("Enter the number of elements: ");
scanf("%d", &n);
if (n 100) {
printf("Invalid number of elements.");
return 1;
}
printf("Enter the elements:");
for (i = 0; i < n; i++) {
scanf("%d", &arr[i]);
}
for (i = 0; i < n; i++) {
if (arr[i] > largest) {
largest = arr[i];
}
if (arr[i] < smallest) {
smallest = arr[i];
}
}
printf("Largest element: %d", largest);
printf("Smallest element: %d", smallest);
return 0;
}
```

This code utilizes `INT_MAX` and `INT_MIN` from the `limits.h` header file for robust initialization. It then iterates through the array, updating `largest` and `smallest` as needed. Error handling is included to check for invalid input.

Example 3: Factorial Calculation

Calculating the factorial of a number (n!) is a classic example demonstrating recursive or iterative approaches. The iterative approach is generally more efficient for larger numbers:```c
#include
int main() {
int n, i;
long long factorial = 1; // Use long long to handle larger factorials
printf("Enter a non-negative integer: ");
scanf("%d", &n);
if (n < 0) {
printf("Factorial is not defined for negative numbers.");
return 1;
}
for (i = 1; i

2025-06-15

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