The difference between a and a in C language is: the operation process of the two is different. a means to use the value of a first, and then add 1 to a; a means to add 1 to a first, Then use the value of a again. Both a and a are equivalent to [a = a 1].
Auto-increment operator:
is an auto-increment operator: such as a, a is equivalent to a = a 1;
So what is the difference between a and a?
Although the equivalent results of a and a are the same, the operation processes are different. a means to use the value of a first, and then add 1 to a; a means to add 1 to a first, and then use the value of a.
Let’s take a look at an example:
#include <stdio.h> int main() { //int m = 10, n1, n2; //n1 = m++;先将m的值赋给n1,然后m再做自增运算,所以此时,n1=10,m=11; //n2 = ++m ;先将m做自增运算,然后在将运算后的m值赋给n2,所以此时,n2=11,m=11; int a = 10,b =10, c, d; c = (a++) + (++a); //由上例n1=m++,n2=++m,m++=11可得出c=10+12;分析:前面括号所得值为10,而前面括号中的a经过自增运算后a的值为11,然后赋值给后面括号中的a,后面括号中的a经过自增运算后a的值为12,后面括号最后赋值为12; d = (++b) + (b++); //由上例n1=m++,n2=++m,++m=11可得出d=11+11;分析:前面括号所得值为11,而前面括号中的a经过自增运算后b的值为11,然后赋值给后面括号中的b,后面括号中的b先将值赋给后面括号,所以后面括号的值为11; printf("c=%d\nd=%d\n",c,d); return 0; }
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