C语言中sumint+=(long)xx[i]是

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C语言中sumint+=(long)xx[i]是
C语言中sumint+=(long)xx[i]是

C语言中sumint+=(long)xx[i]是
xx[i]是个数组.但它的数值不是长整型的.
(long)xx[i]将其变为强整型.
然后,sumint=sumint+该值