C_for.html

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基本的for循环语法如下：

for (初始条件； 循环条件； 计数器改变)

基本的for循环
循环条件和计数器改变
没有计数器的for循环

basic for loop

 

#include <stdio.h>

 

int main()

{

    

    int i;

    for( i = 0; i < 5; i++) {

        printf("i = %d\n",i)    ;

    }

 

    return 1;

}

 

Result :---------------------------------------

 

i = 0

i = 1

i = 2

i = 3

i = 4

 

 

loop condition and counter change

 

#include <stdio.h>

 

int main()

{

    

    int i;

    

    printf("Output of for( i = 0; i < 5; i++) ===\n");

    for( i = 0; i < 5; i++) {

        printf("i = %d\n",i)    ;

    }

    

    printf("\n\n");

    printf("Output of for( i = 0; i <= 5; i++) ===\n");

    for( i = 0; i <= 5; i++) {

        printf("i = %d\n",i)    ;

    }

    

    printf("\n\n");

    printf("Output of for( i = 0; i <= 5; ++i) ===\n");

    for( i = 0; i <= 5; ++i) {

        printf("i = %d\n", i);

    }

 

    return 1;

}

 

Result :---------------------------------------

 

Output of for( i = 0; i < 5; i++) ===

i = 0

i = 1

i = 2

i = 3

i = 4

 

 

Output of for( i = 0; i <= 5; i++) ===

i = 0

i = 1

i = 2

i = 3

i = 4

i = 5

 

 

Output of for( i = 0; i <= 5; ++i) ===

i = 0

i = 1

i = 2

i = 3

i = 4

i = 5

 

 

 

for() loop with no counter

 

#include <stdio.h>

 

int main()

{

    

    int i = 0;

    

    printf("Output of for( ; ; ) ===\n");

    for( ; ; ) {

        i = i + 1;

        printf("i = %d\n",i);

        

        if(i >= 5) {

            break;

        }

    }

 

    return 1;

}

 

Result :---------------------------------------

 

Output of for( ; ; ) ===

i = 1

i = 2

i = 3

i = 4

i = 5```