


Explain compile-time initialization and run-time initialization in C programming
让我们用数组的概念来讨论编译时和运行时初始化 -
数组
数组是存储在连续内存位置的项目的集合,元素可以通过使用来访问
编译时数组初始化
在编译时初始化中,用户必须在程序本身中输入详细信息。
编译时初始化与变量相同初始化。数组初始化的一般形式如下 -
语法
type name[size] = { list_of_values }; //integer array initialization int rollnumbers[4]={ 2, 5, 6, 7}; //float array initialization float area[5]={ 23.4, 6.8, 5.5,7.3,2.4 }; //character array initialization char name[9]={ 'T', 'u', 't', 'o', 'r', 'i', 'a', 'l', '\0' };
示例
以下是显示数组的 C 程序 -
现场演示
#include<stdio.h> void main(){ //Declaring array with compile time initialization// int array[5]={1,2,3,4,5}; //Declaring variables// int i; //Printing O/p using for loop// printf("Displaying array of elements :"); for(i=0;i<5;i++){ printf("%d ",array[i]); } }
输出
Displaying array of elements :1 2 3 4 5
运行时数组初始化
使用运行时初始化,用户可以在程序的不同运行期间接受或输入不同的值。
它也用于初始化大型数组或具有用户指定值的数组。还可以使用 scanf() 函数在运行时初始化数组。
示例
以下是一个 C 程序,用于使用运行时编译计算数组中所有元素的和与积 -
现场演示
#include<stdio.h> void main(){ //Declaring the array - run time// int A[2][3],B[2][3],i,j,sum[i][j],product[i][j]; //Reading elements into the array's A and B using for loop// printf("Enter elements into the array A: </p><p>"); for(i=0;i<2;i++){ for(j=0;j<3;j++){ printf("A[%d][%d] :",i,j); scanf("%d",&A[i][j]); } printf("</p><p>"); } for(i=0;i<2;i++){ for(j=0;j<3;j++){ printf("B[%d][%d] :",i,j); scanf("%d",&B[i][j]); } printf("</p><p>"); } //Calculating sum and printing output// printf("Sum array is : </p><p>"); for(i=0;i<2;i++){ for(j=0;j<3;j++){ sum[i][j]=A[i][j]+B[i][j]; printf("%d\t",sum[i][j]); } printf("</p><p>"); } //Calculating product and printing output// printf("Product array is : </p><p>"); for(i=0;i<2;i++){ for(j=0;j<3;j++){ product[i][j]=A[i][j]*B[i][j]; printf("%d\t",product[i][j]); } printf("</p><p>"); } }
输出
Enter elements into the array A: A[0][0] :A[0][1] :A[0][2] : A[1][0] :A[1][1] :A[1][2] : B[0][0] :B[0][1] :B[0][2] : B[1][0] :B[1][1] :B[1][2] : Sum array is : 000 000 Product array is : 000 000
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