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C Exercises: Counts the number of positive numbers and print the average of all positive values

C Basic Declarations and Expressions: Exercise-28 with Solution

Write a C program that read 5 numbers and counts the number of positive numbers and print the average of all positive values.

Pictorial Presentation:

C Programming: Counts the number of positive numbers and print the average of all positive values

C Code:

#include <stdio.h>
int main() {
	float numbers[5],total=0, avg;
	int j, pctr=0; 
	printf("\nInput the first number: "); 
    scanf("%f", &numbers[0]);
    printf("\nInput the second number: "); 
    scanf("%f", &numbers[1]);
    printf("\nInput the third number: "); 
    scanf("%f", &numbers[2]);
	printf("\nInput the fourth number: "); 
    scanf("%f", &numbers[3]);
    printf("\nInput the fifth number: "); 
    scanf("%f", &numbers[4]);
	for(j = 0; j < 5; j++) {
		if(numbers[j] > 0)
		{
			pctr++;
			total += numbers[j];
		}	
    }
    avg = total/pctr;
	printf("\nNumber of positive numbers: %d", pctr);
	printf("\nAverage value of the said positive numbers: %.2f", avg);
	printf("\n");
	return 0;
}

Sample Output:

Input the first number: 5                                              
                                                                       
Input the second number: 8                                             
                                                                       
Input the third number: 10                                             
                                                                       
Input the fourth number: -5                                            
                                                                       
Input the fifth number: 25                                             
                                                                       
Number of positive numbers: 4                                          
Average value of the said positive numbers: 12.00

Flowchart:

C Programming Flowchart: Counts the number of positive numbers and print the average of all positive values

C Programming Code Editor:


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C Programming: Tips of the Day

Is there a way to specify how many characters of a string to print out using printf()?

The basic way is:

printf ("Here are the first 8 chars: %.8s\n", "A string that is more than 8 chars");

The other, often more useful, way is:

printf ("Here are the first %d chars: %.*s\n", 8, 8, "A string that is more than 8 chars");

Here, you specify the length as an int argument to printf(), which treats the '*' in the format as a request to get the length from an argument.

You can also use the notation:

printf ("Here are the first 8 chars: %*.*s\n",
        8, 8, "A string that is more than 8 chars");

This is also analogous to the "%8.8s" notation, but again allows you to specify the minimum and maximum lengths at runtime - more realistically in a scenario like:

printf("Data: %*.*s Other info: %d\n", minlen, maxlen, string, info);

The POSIX specification for printf() defines these mechanism

Ref : https://bit.ly/3u32GyO