C语言 #includeint main(void){\x09int a = 10; \x09int b = 90;\x09int c = sum(a,b);\x09return c;}

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C语言#includeintmain(void){\x09inta=10;\x09intb=90;\x09intc=sum(a,b);\x09returnc;}C语言#includeintmain(v

C语言 #includeint main(void){\x09int a = 10; \x09int b = 90;\x09int c = sum(a,b);\x09return c;}
C语言
#include
int main(void)
{
\x09int a = 10;
\x09int b = 90;
\x09int c = sum(a,b);
\x09return c;
}

C语言 #includeint main(void){\x09int a = 10; \x09int b = 90;\x09int c = sum(a,b);\x09return c;}
#include<stdio.h>
int sum( int a, int b)//增加函数定义
{
\x09return a+b ;
}
int main(void)
{
\x09int a = 10;
\x09int b = 90;
\x09int c = sum(a,b);
\x09printf("%d\n", c ); //输出结果
\x09return 0; //
}