首先main()函数调用fun2函数,n=5678,m=0.n!=0,执行return(fun2(n/10,m*10+n%10));此时n=567,m=8;n!=0,执行return(fun2(n/10,m*10+n%10));此时n=56,m=87;n!=0,执行return(fun2(n/10,m*10+n%10));此时n=5,m=876;n!=0,执行return(fun2(n/10,m*10+n%10));此时n=0,m=8765;n==0,函数返回m值,为8765.显示8765....
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